Carrier RTU-MP, Integration Manual

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Appendix C: Modbus Protocol Implementation Conformance Statement
48 RTU-MP Controller
Signed Integer (SINT) -32768 - 32767
3 – Read Holding Register
6 – Preset Single Register
16 – Preset Multiple Register
Discrete Input (DI) 0 = Off, 1 = On 2 – Read Input Status
Discrete Output (DO) 0 = Off, 1 = On
1 – Read Coil Status
5 – Force Single Coil
15 – Force Multiple Coils