LG ACHH017VBAB Installation And Owner's Manual page 55

CAUTION
!
If the product enters the modbus remote mode, all the information can only be monitored via
HMI, and the actual operation of starting/stopping or changing the set temperature can only
be done through the external controller.
To make changes to control from HMI, change the control mode to "Local".
CAUTION
!
CH10009 remote communication error will occur when the communication is disconnected
between the two controllers. When the communication is recovered, it will automatically
resume. If the remote modbus connection is not used, reset the power of the main PCB of
the unit to cancel the alarm.
The protocol details provided for modbus interlock of external device are as follows.
- Physical Layer : RS-485 Serial Line
- Mode : MODBUS RTU Mode
- Baud Rate : 9 600
- Parity : None Parity
- 1 Stop Bit
- Applied Function Code
Function
Sub Function
Code
0x01 None
0x02 None
0x03 None
0x04 None
0x05 None
0x06 None
0xF1~FF Reserved for Exception Code
Refer to the modbus protocol in the Appendix for the protocols provided.
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG" is a registered trademark of LG Corp.
Start Address form Master
Function Name
Read Coil Register
Read Discrete Input Register Address-10001
Read Holding Register Address-40001
Read Input Register Address-30001
Write Single Coil
Write Single Holding Register Address-40001
HMI SCREENS
Device
Address-1
Register Address-1
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