go fmt ./...
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SHA256:zZji7w1Ilh2RuUpbQcqkLPrqmRwpiCSycbF2EfKm6Kw
2 changed files with 122 additions and 87 deletions
187
modbus/client.go
187
modbus/client.go
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@ -31,13 +31,16 @@ func NewClient2(packager Packager, transporter Transporter) Client {
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}
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// Request:
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// Function code : 1 byte (0x01)
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// Starting address : 2 bytes
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// Quantity of coils : 2 bytes
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//
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// Function code : 1 byte (0x01)
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// Starting address : 2 bytes
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// Quantity of coils : 2 bytes
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//
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// Response:
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// Function code : 1 byte (0x01)
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// Byte count : 1 byte
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// Coil status : N* bytes (=N or N+1)
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//
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// Function code : 1 byte (0x01)
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// Byte count : 1 byte
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// Coil status : N* bytes (=N or N+1)
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func (mb *client) ReadCoils(address, quantity uint16) (results []byte, err error) {
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if quantity < 1 || quantity > 2000 {
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err = fmt.Errorf("modbus: quantity '%v' must be between '%v' and '%v',", quantity, 1, 2000)
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@ -62,13 +65,16 @@ func (mb *client) ReadCoils(address, quantity uint16) (results []byte, err error
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}
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// Request:
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// Function code : 1 byte (0x02)
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// Starting address : 2 bytes
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// Quantity of inputs : 2 bytes
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//
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// Function code : 1 byte (0x02)
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// Starting address : 2 bytes
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// Quantity of inputs : 2 bytes
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//
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// Response:
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// Function code : 1 byte (0x02)
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// Byte count : 1 byte
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// Input status : N* bytes (=N or N+1)
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//
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// Function code : 1 byte (0x02)
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// Byte count : 1 byte
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// Input status : N* bytes (=N or N+1)
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func (mb *client) ReadDiscreteInputs(address, quantity uint16) (results []byte, err error) {
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if quantity < 1 || quantity > 2000 {
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err = fmt.Errorf("modbus: quantity '%v' must be between '%v' and '%v',", quantity, 1, 2000)
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@ -93,13 +99,16 @@ func (mb *client) ReadDiscreteInputs(address, quantity uint16) (results []byte,
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}
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// Request:
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// Function code : 1 byte (0x03)
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// Starting address : 2 bytes
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// Quantity of registers : 2 bytes
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//
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// Function code : 1 byte (0x03)
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// Starting address : 2 bytes
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// Quantity of registers : 2 bytes
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//
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// Response:
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// Function code : 1 byte (0x03)
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// Byte count : 1 byte
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// Register value : Nx2 bytes
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//
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// Function code : 1 byte (0x03)
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// Byte count : 1 byte
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// Register value : Nx2 bytes
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func (mb *client) ReadHoldingRegisters(address, quantity uint16) (results []byte, err error) {
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if quantity < 1 || quantity > 125 {
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err = fmt.Errorf("modbus: quantity '%v' must be between '%v' and '%v',", quantity, 1, 125)
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@ -124,13 +133,16 @@ func (mb *client) ReadHoldingRegisters(address, quantity uint16) (results []byte
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}
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// Request:
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// Function code : 1 byte (0x04)
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// Starting address : 2 bytes
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// Quantity of registers : 2 bytes
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//
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// Function code : 1 byte (0x04)
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// Starting address : 2 bytes
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// Quantity of registers : 2 bytes
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//
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// Response:
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// Function code : 1 byte (0x04)
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// Byte count : 1 byte
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// Input registers : N bytes
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//
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// Function code : 1 byte (0x04)
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// Byte count : 1 byte
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// Input registers : N bytes
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func (mb *client) ReadInputRegisters(address, quantity uint16) (results []byte, err error) {
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if quantity < 1 || quantity > 125 {
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err = fmt.Errorf("modbus: quantity '%v' must be between '%v' and '%v',", quantity, 1, 125)
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@ -155,13 +167,16 @@ func (mb *client) ReadInputRegisters(address, quantity uint16) (results []byte,
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}
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// Request:
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// Function code : 1 byte (0x05)
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// Output address : 2 bytes
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// Output value : 2 bytes
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//
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// Function code : 1 byte (0x05)
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// Output address : 2 bytes
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// Output value : 2 bytes
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//
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// Response:
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// Function code : 1 byte (0x05)
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// Output address : 2 bytes
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// Output value : 2 bytes
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//
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// Function code : 1 byte (0x05)
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// Output address : 2 bytes
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// Output value : 2 bytes
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func (mb *client) WriteSingleCoil(address, value uint16) (results []byte, err error) {
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// The requested ON/OFF state can only be 0xFF00 and 0x0000
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if value != 0xFF00 && value != 0x0000 {
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@ -196,13 +211,16 @@ func (mb *client) WriteSingleCoil(address, value uint16) (results []byte, err er
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}
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// Request:
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// Function code : 1 byte (0x06)
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// Register address : 2 bytes
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// Register value : 2 bytes
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//
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// Function code : 1 byte (0x06)
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// Register address : 2 bytes
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// Register value : 2 bytes
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//
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// Response:
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// Function code : 1 byte (0x06)
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// Register address : 2 bytes
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// Register value : 2 bytes
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//
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// Function code : 1 byte (0x06)
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// Register address : 2 bytes
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// Register value : 2 bytes
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func (mb *client) WriteSingleRegister(address, value uint16) (results []byte, err error) {
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request := ProtocolDataUnit{
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FunctionCode: FuncCodeWriteSingleRegister,
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@ -232,15 +250,18 @@ func (mb *client) WriteSingleRegister(address, value uint16) (results []byte, er
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}
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// Request:
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// Function code : 1 byte (0x0F)
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// Starting address : 2 bytes
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// Quantity of outputs : 2 bytes
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// Byte count : 1 byte
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// Outputs value : N* bytes
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//
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// Function code : 1 byte (0x0F)
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// Starting address : 2 bytes
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// Quantity of outputs : 2 bytes
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// Byte count : 1 byte
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// Outputs value : N* bytes
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//
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// Response:
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// Function code : 1 byte (0x0F)
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// Starting address : 2 bytes
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// Quantity of outputs : 2 bytes
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//
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// Function code : 1 byte (0x0F)
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// Starting address : 2 bytes
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// Quantity of outputs : 2 bytes
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func (mb *client) WriteMultipleCoils(address, quantity uint16, value []byte) (results []byte, err error) {
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if quantity < 1 || quantity > 1968 {
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err = fmt.Errorf("modbus: quantity '%v' must be between '%v' and '%v',", quantity, 1, 1968)
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@ -274,15 +295,18 @@ func (mb *client) WriteMultipleCoils(address, quantity uint16, value []byte) (re
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}
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// Request:
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// Function code : 1 byte (0x10)
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// Starting address : 2 bytes
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// Quantity of outputs : 2 bytes
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// Byte count : 1 byte
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// Registers value : N* bytes
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//
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// Function code : 1 byte (0x10)
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// Starting address : 2 bytes
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// Quantity of outputs : 2 bytes
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// Byte count : 1 byte
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// Registers value : N* bytes
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//
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// Response:
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// Function code : 1 byte (0x10)
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// Starting address : 2 bytes
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// Quantity of registers : 2 bytes
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//
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// Function code : 1 byte (0x10)
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// Starting address : 2 bytes
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// Quantity of registers : 2 bytes
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func (mb *client) WriteMultipleRegisters(address, quantity uint16, value []byte) (results []byte, err error) {
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if quantity < 1 || quantity > 123 {
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err = fmt.Errorf("modbus: quantity '%v' must be between '%v' and '%v',", quantity, 1, 123)
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@ -316,15 +340,18 @@ func (mb *client) WriteMultipleRegisters(address, quantity uint16, value []byte)
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}
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// Request:
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// Function code : 1 byte (0x16)
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// Reference address : 2 bytes
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// AND-mask : 2 bytes
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// OR-mask : 2 bytes
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//
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// Function code : 1 byte (0x16)
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// Reference address : 2 bytes
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// AND-mask : 2 bytes
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// OR-mask : 2 bytes
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//
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// Response:
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// Function code : 1 byte (0x16)
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// Reference address : 2 bytes
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// AND-mask : 2 bytes
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// OR-mask : 2 bytes
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//
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// Function code : 1 byte (0x16)
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// Reference address : 2 bytes
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// AND-mask : 2 bytes
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// OR-mask : 2 bytes
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func (mb *client) MaskWriteRegister(address, andMask, orMask uint16) (results []byte, err error) {
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request := ProtocolDataUnit{
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FunctionCode: FuncCodeMaskWriteRegister,
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@ -359,17 +386,20 @@ func (mb *client) MaskWriteRegister(address, andMask, orMask uint16) (results []
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}
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// Request:
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// Function code : 1 byte (0x17)
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// Read starting address : 2 bytes
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// Quantity to read : 2 bytes
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// Write starting address: 2 bytes
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// Quantity to write : 2 bytes
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// Write byte count : 1 byte
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// Write registers value : N* bytes
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//
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// Function code : 1 byte (0x17)
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// Read starting address : 2 bytes
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// Quantity to read : 2 bytes
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// Write starting address: 2 bytes
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// Quantity to write : 2 bytes
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// Write byte count : 1 byte
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// Write registers value : N* bytes
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//
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// Response:
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// Function code : 1 byte (0x17)
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// Byte count : 1 byte
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// Read registers value : Nx2 bytes
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//
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// Function code : 1 byte (0x17)
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// Byte count : 1 byte
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// Read registers value : Nx2 bytes
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func (mb *client) ReadWriteMultipleRegisters(readAddress, readQuantity, writeAddress, writeQuantity uint16, value []byte) (results []byte, err error) {
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if readQuantity < 1 || readQuantity > 125 {
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err = fmt.Errorf("modbus: quantity to read '%v' must be between '%v' and '%v',", readQuantity, 1, 125)
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@ -397,14 +427,17 @@ func (mb *client) ReadWriteMultipleRegisters(readAddress, readQuantity, writeAdd
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}
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// Request:
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// Function code : 1 byte (0x18)
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// FIFO pointer address : 2 bytes
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//
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// Function code : 1 byte (0x18)
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// FIFO pointer address : 2 bytes
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//
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// Response:
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// Function code : 1 byte (0x18)
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// Byte count : 2 bytes
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// FIFO count : 2 bytes
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// FIFO count : 2 bytes (<=31)
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// FIFO value register : Nx2 bytes
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//
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// Function code : 1 byte (0x18)
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// Byte count : 2 bytes
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// FIFO count : 2 bytes
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// FIFO count : 2 bytes (<=31)
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// FIFO value register : Nx2 bytes
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func (mb *client) ReadFIFOQueue(address uint16) (results []byte, err error) {
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request := ProtocolDataUnit{
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FunctionCode: FuncCodeReadFIFOQueue,
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@ -67,12 +67,13 @@ type tcpPackager struct {
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}
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// Encode adds modbus application protocol header:
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// Transaction identifier: 2 bytes
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// Protocol identifier: 2 bytes
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// Length: 2 bytes
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// Unit identifier: 1 byte
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// Function code: 1 byte
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// Data: n bytes
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//
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// Transaction identifier: 2 bytes
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// Protocol identifier: 2 bytes
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// Length: 2 bytes
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// Unit identifier: 1 byte
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// Function code: 1 byte
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// Data: n bytes
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func (mb *tcpPackager) Encode(pdu *ProtocolDataUnit) (adu []byte, err error) {
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adu = make([]byte, tcpHeaderSize+1+len(pdu.Data))
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@ -118,10 +119,11 @@ func (mb *tcpPackager) Verify(aduRequest []byte, aduResponse []byte) (err error)
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}
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// Decode extracts PDU from TCP frame:
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// Transaction identifier: 2 bytes
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// Protocol identifier: 2 bytes
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// Length: 2 bytes
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// Unit identifier: 1 byte
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//
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// Transaction identifier: 2 bytes
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// Protocol identifier: 2 bytes
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// Length: 2 bytes
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// Unit identifier: 1 byte
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func (mb *tcpPackager) Decode(adu []byte) (pdu *ProtocolDataUnit, err error) {
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// Read length value in the header
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length := binary.BigEndian.Uint16(adu[4:])
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