The couplers CJ1W-SCU and CS1W-SCU (V1.3) have Modbus slave driver and support the following modbus commands:

• 01, 02 reading bit multiples (IOC)
• 03 reading records (DM)
• 04 reading words I / O IOC
• 05 writing bit
• 06 write single register (DM)
• 08 test echo
• 0F writing multiple bit
• 10 writing multiple registers

The instruction applied to CMND cards SCU mode gateway can generate the Modbus master.

See also Getting Started With Modbus for a full list of sample programs for different hardware.