Samsung MIM-B19N - Communication sequence

9
English
Installation
Communication sequence
System Initialization
࡙ At start-up, all registers have the value 0.
࡙ Ǯ˵ʪϩ˵ʪϩθɇʀ˝ͱ˙ϩ˵ʪđͱʒɵЇϑϩʪθ˙ɇʀʪͱʒЇʪϑʀͱΧʪϩʪʒࡡɵϩϑߡϩͱߣͱ˙ϩ˵ʪʀͱЇʀɇϩͱϑϩɇϩЇϑθʪ˝ϑϩʪθ࣍θʪ˝ϑϩʪθ
ߢ࣎˙ͱθʪɇʀ˵ʒͱͱθЇϩɇθʪЇΧʒɇϩʪʒϩͱߢࢋ
࡙ Ã˙ɇɵϩϑߡϩͱߣͱ˙θʪ˝ϑϩʪθߢɇθʪߢʪЭʪ˙ͱθͱʪʒͱͱθЇϩࡡϩʪɇϑϩ˵ɇϩϩ˵ʪϩθɇʀ˝ͱ˙ɇʒͱͱθɇʒͱЇϩʒͱͱθЇϩϑ˵ɇϑ
been completed, and that all indoor and outdoor register values have been updated.
࡙ If bit 0 of the communication status register for an indoor unit is 0, it means that this indoor unit is not connected.
࡙ After the power is turned on, the BMS periodically reads the communication status register values of indoor units. Then, if
ɇʒͱͱθЇϩиϩ˵ɇɵϩϑߡϩͱߣͱ˙ϩ˵ʪθʪ˝ϑϩʪθϑʪϩϩͱߢϑ˙ͱЇʒࡡʀͱϩθͱɇʒͱϩͱθ˝ɇθʪɇЭɇɇɵʪ˙ͱθϩ˵ʪ˙ͱЇʒʒͱͱθ
unit from that time.
࡙ Ɵ˵ʪ9đƊʀɇͱцʀͱϩθͱϩ˵ʪʒͱͱθЇϩϑиϩ˵ɇɵϩϑߡϩͱߣͱ˙ϩ˵ʪʀͱЇʀɇϩͱϑϩɇϩЇϑθʪ˝ϑϩʪθ˙ͱθϩ˵ʪʒͱͱθЇϩϑʪϩϩͱߢࢋ
Monitor and operate units from the BMS
࡙ When the BMS writes a value to the holding register, a control command is sent to the relevant indoor unit.
࡙ The holding register value for an indoor unit is not updated until a changed status value is received from that indoor unit.
࡙ Because the user might be able to operate indoor units with a remote control, the BMS must reads their status periodically.
࡙ If communication between an indoor/outdoor unit and the Modbus interface module is stopped, the last status value is
retained until communication is resumed.
Modbus
interface module
Communication status
(51 bits 0 to 2): 0 (Not Ready)
Check
communication
status.
Monitoring
&
control
Power on
Communication status
(51 bits 0 to 2) : 7 (Ready)
Indoor unit
BMS
Power on
Check communication status (51).
Response: 0 (Not Ready)
Tracking
Response: Status
Change a value.
Response: Status
Check communication status (51).
Response: 7 (Ready)
Check indoor status
(input & holding registers).
Response: Status
Change a value in the holding registers.
Response
Check indoor status
(input & holding registers).
Response: Status