
Shenzhen Hpmont Technology Co., Ltd.
Appendix B Communication Protocol
HD5L Series Controller User Manual V1.4
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117
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Appendix B
Communication Protocol
1.
Introduction
HD5L series controllers 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 code, read the status parameters and write the
control command etc. The controller is in slave mode when it is communicating.
Communication Terminal
The SCI terminal is shown in following table.
Type
Name
Terminal description
SCI terminal
Pin Difinition
1,3 +5V
2 485+
4,5,6 GND
7 485-
8 Unused
The transmitting mode is shown in following table.
Port
Asyn, half-duplex
Format
1-8-2 (1 start bit, 8 data bits, 2 stop bits), no parity, RTU
Baut rate
9600bps
Relative setting
Refe to F14: SCI Communication Parameters, on page 72
Network Mode
RJ45
1
8
PC master
PLC master
RS232/RS485
switching module
RS232/RS485
switching module
HD5L
HD5L
HD5L
RS485
PC master
PLC master
HD50
RS485
HD50
Single-master and multi-slave
Single-master and single-slave
B