Shenzhen Hpmont Technology Co., Ltd.
Appendix B Communication Protocol
HD3N-L Series User Manual V1.0
- 77
-
Appendix B
Communication Protocol
1.
Introduction
HD3N-L provide one RS485 communication interface which uses the standard Modbus
communication protocol.
By using the host computer (including communication devices such as computer and PLC) the user
can operate to read-write the controller’s function parameters, read the status parameters and write
the control command etc.
The controller is in slave mode when it is communicating.
Communication Terminal
For the communication terminals, see section 4.5, page 16. The transmitting mode is shown in the
table below.
Port
Asynchronous, half duplex
Format
1-8-2 (11 start bit, 8 data bits, 2 stop bits), no check, RTU
Baut Rate
9600bps
Relative Setting
F14: SCI Communication Parameter
2. Network Mode
Single host, single sub-machine
PLC host
PLC host
RS232/RS485
witch module
RS485
Single host, multi sub-machine
PLC host
PLC hose
RS232/RS485
witch module
RS485
Controller
Controller
Controller
Controller
Controller
B
