Samsung MIM-B19N - Page 10

Installing the Modbus Interface Module
10
English
Installation
CAUTION
࡙ Ęͱϩʪϩ˵ɇϩи˵ʪϩ˵ʪǮθϩʪƊ˝ʪŵʪ˝ϑϩʪθͱθǮθϩʪđЇϩΧʪŵʪ˝ϑϩʪθϑʀͱɇʒϑθʪʀʪЭʪʒ˙ͱθɇ˵ͱʒ˝θʪ˝ϑϩʪθϑ࣍ϑʪʪ
ƟɇɵʪߣࢋđͱʒɵЇϑŵʪ˝ϑϩʪθƟɇɵʪ࣎˙θͱϩ˵ʪđͱʒɵЇϑɇϑϩʪθࡡϩ˵ʪđͱʒɵЇϑϩʪθ˙ɇʀʪͱʒЇʪ࣍đÃđࣗ9ߢߪĘࢥđÃđࣗ9ߢߪĘƟ࣎ɇиɇцϑ
sends a control command to the indoor units. Therefore, be sure to send a command to the Modbus master only when
control (operation on/off, temperature setting, etc.) is required.
࡙ If an identical command is issued consecutively, the same command is repeatedly sent to the indoor units.
To check whether the write command operates normally, send a write command to the master and then read the register
status.
࡙ Ǯ˵ʪθʪɇʒ˝˙θͱͱθиθϩ˝ϩͱɇθʪ˝ϑϑϩʪθʀͱϑʪʀЇϩЭʪцࡡɵʪϑЇθʪϩͱϑʪʒɇʀͱɇʒɇϩʪɇϑϩߢߡϑɇ˙ϩʪθϩ˵ʪɇϑϩ
response is received from the Modbus interface module.
Table 1. Example of signal flow
Modbus
interface module
Indoor unit RemarkBMS
Indoor power on
Response: Indoor power on
Indoor Power on
Response: Power on
Indoor power off
Response: Indoor power off
Indoor power off
Response: Power off
Indoor power on
Response: Indoor power on
Indoor power on
Response: Power on
Indoor power on
Response: Indoor power on
Indoor power on
Response: Power on
Indoor power on
Response: Indoor power on
Indoor power on
Response: Power on