Intelligent Technologies Modbus to QCPort Adapter Manual
January 2006
MN05002002E (C)
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Page 57
Appendix A: Supported Modbus Function Codes
Access Type
Description
Code
Data Access
Physical Discrete Inputs
Read Input Status
0x02 (2)
Read Coil status
0x01 (1)
Force Single Coil
0x05 (5)
Bit
Internal Bits or Physical Coils
Write Multiple Coils
0x0F (15)
Physical Input Registers
Read Input Registers
0x04 (04)
Read Holding Registers
0x03 (3)
Write Single Register
0x06 (6)
Write Multiple Registers
0x10 (16)
Read/Write Multiple
Registers
0x17 (23)
16 bits
Internal Registers or Physical
Output Registers
Mask Write Register
0x16 (22)
Diagnostics
Read Exception status
0x07 (7)
Diagnostics 0x08
(8)
User Defined
QCPort Pass Through
0x41 (65)
Reset Services
0x42 (66)
Notice
The entire register space for the D77D-EMA is a shared register space, therefore
each register supports each function code.
Read Exception Status 0x07 (7)
Bit Description
0
1 = Adapter Faulted
0 = Adapter OK
1 – 7
Reserved