CiDRA Passive Sonar Transmitters - Manual (Page 13)

2.4 Transmitter MODBUS Supported Function Codes
The transmitter supports these MODBUS Function Codes:
Code Sub Code Function
01 Read Coils
02 Read Discrete Inputs
03 Read holding Registers
04 Read Input Registers
05 Write Single Coil
06 Write Single Registers
07 Read Exception Status (Serial only)
08 Diagnostics (Serial only)
08 00 Return Query Data
08 01 Restart Communications Option
08 02 Return Diagnostic Register
08 03 Change ASCII Input Delimiter
08 04 Force Listen Only Mode
08 10 Clear Counters and Diagnostic Register
08 11 Return Bus Message Count
08 12 Return Bus Communications Error Count
08 13 Return Bus Exception Error Count
08 14 Return Slave Message Count
08 15 Return Slave No Response Count
08 16 Return Slave NAK Count
08 17 Return Slave Busy Count
08 18 Return Bus Character Overrun Count
08 20 Clear Overrun Counter and Flag
11 Get Communications Event Counter (Serial only)
12 Get Communications Event Log (Serial only)
15 Write Multiple Coils
16 Write Multiple Registers
17 Report Slave ID (Serial only)
22 Mask Write register
23 Read/Write Multiple registers
43 14 Read Device Identification
Table 1 Supported Modbus Function Codes
The transmitter does NOT support these MODBUS Function Codes:
Code Sub Code Function
20 Read File Record
21 Write File Record
24 Read FIFO Queue
Table 2 Non-Supported Modbus Function Codes
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