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Chapter 7 Modbus/TCP 7-1

Publication PUB-AB7603-014

Modbus/TCP Interface

The BridgeWay supports Modbus/TCP commands. The implementation of the

Modbus/TCP server is done according to the Modbus/TCP specification 1.0. All

commands according to class 0 and class 1 are implemented and a subset of the

class 2 commands.

The module can handle 8 simultaneous connections.

Supported Commands

The following Modbus/TCP commands are supported by the BridgeWay.

Function Code Function Name Class Affects Address Method

1 Read Coils 1 IN/OUT Bit

2 Read Input Discrete 1 IN/OUT Bit

3 Read Multiple Registers 0 IN/OUT Word

4 Read Input Registers 1 IN/OUT Word

5 Write Coil 1 OUT Bit

6 Write Single Register 1 OUT Word

15 Force Multiple Coils 2 OUT Bit

16 Force Multiple Registers 0 OUT Word

22 Mask Write Registers 2 OUT

23 Read/Write Registers 2 IN/OUT

Table 7-1 Modbus Commands

1 2 ... 69 70 71 72 73 74 75 76 77 78 79 ... 146 147

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