Modbus Communication; Modbus Data Base; Function Code Support; Broadcast Messages - rotork Modbus IQ Pro Technical Manual

12.3 Modbus Communication

The electrical properties of the MFU in Mk1 mode are the same as in Mk2 mode:
Line Electrical Specification:
Modbus Transmission Mode
Supported Baud Rates
Number of bits per character
Parity (configurable)
Variants

12.4 Modbus Data Base

Message format:
Modbus Address:

12.4.1 Function Code Support

Function
Code
01 Read Output Coil Status
02 Read Input Status
03 Read Holding Registers
04 Read Input Registers
05 Force Single Coil
06 Preset Single Register
07 Read Exception Status
08 Loopback Diagnostic Test
15 Force Multiple Coils
16 Preset Multiple Registers
17 Report Slave ID

12.4.2 Broadcast Messages

Broadcast messages using code 05 and 06 are allowed to the following functions
Open command
ESD command
RS-485, two-wire, half duplex (4 wire not supported)
RTU (8 bit Binary data)
300, 600, 1k2, 2k4, 4k8, 9k6, 19k2, 38k4, 57k6, 115k2
(2k4, 4k8, 9k6, 19k2, 38k4, 57k6, 115k2 when using the
internal repeater option)
1 start bit, 8 data bits, Parity bit, 1 or 2 stop bits
Odd, Even, None
Single highway plus analogue input
Dual highway (one common address and baud rate)
Single highway with repeater
RTU
1 to 247 (Dual channel version both channels must have
the same address.)
Modbus Name
Publication PUB091-003-00_0119
Appendix A - Mk1 Data Base
Addressing
Discrete
Discrete
Register
Register
Discrete
Register
Discrete
Register
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