AnyBus® Communicator Protocol Appendix - Modbus
DOC. ABC-APPENDIX-MB Rev.0.91
2001-08-01
HMS INDUSTRIAL NETWORKS AB
7
2 Read Input Status
Query
Starting Address
2 byte value where you enter the first address of the requested discrete
inputs.
No. of Points
2 byte value where you enter the number of inputs 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 5: Read Input Status
3 Read Holding Registers
Query
Starting Address
2 byte value where you enter the first address of the requested registers.
No. of Points
2 byte value where you enter the number of registers 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 6: Read Holding Registers
4 Read Input Registers
Query
Starting Address
2 byte value where you enter the first address of the requested registers.
No. of Points
2 byte value where you enter the number of registers 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 7: Read Input Registers
5 Force Single Coil
Query
Data
Data object with 4 bytes. The fieldbus master should enter Coil Address
and Force Data in these four bytes.
Response Data
Data object with 4 bytes. The slave returns Coil Address and Forced Data
in these 4 bytes.
Table 8: Force Single Coil
6 Preset Single Register
Query
Data
Data object with 4 bytes. The fieldbus master should enter Register
Address and Preset Data in these four bytes.
Response Data
Data object with 4 bytes. The slave returns Register Address and Preset
Data in these 4 bytes.
Table 9: Preset Single register
