User manual

Chapter 7 Modbus/TCP 7-1
© 2011 Pyramid Solutions Inc.
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