HMS Anybus Communicator for Modbus RTU, Руководство пользователя

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AnyBus® Communicator Protocol Appendix - Modbus
DOC. ABC-APPENDIX-MB Rev.0.91
2001-08-01
6 HMS INDUSTRIAL NETWORKS AB
1.3 Modbus commands
The following tables list all Modbus commands that are supported by the AB-C. For each command there is an expla-
nation about what actions you as user need to take on the query and response.
Code Name
01 Read 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
11 Fetch Comm. Event Ctr
12 Fetch Comm. Event Log
15 Force Multiple Coils
16 Preset Multiple Registers
17 Report Slave ID
20 Read General Reference
21 Write General Reference
22 Mask Write 4X Register
23 Read/Write 4X Register
24 Read FIFO Queue
Table 3: Modbus Commands
1 Read Coil Status
Query Starting Address 2 byte value where you enter the first address of the requested coils.
No. of Points 2 byte value where you enter the number of coils to read.
Response Byte Count 1 byte value where you enter the number of expected data bytes.
Data Data object where you enter the length of the received data and the
destination address.
Table 4: Read Coil Status