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Appendix B – Modbus Register Map
Details of Modbus RTU connection interface:
● Protocol: Modbus RTU @ Full Duplex (4-wire RS485)
● Baud: 115200
● Data bits: 8
● Parity: None
● Stop bits: 1
● Device ID = ID + 10 (for example: SCiB cabinet ID = 0, Modbus RTU Device ID = 10)
● Function: Read Holding Register(s)
● Duration: up to 11 bytes
● Error: Modbus RTU specifications
Name
Host Status
40010
Cabinet Fault
40011
Status
String Fault Status
40012
Warning Status
40014
System Parameters and Firmware Modbus Holding Registers
Name
Fully charged string voltage
Cutoff string voltage
Over-charge current (warning)
Over-discharge current (warning)
Max cell voltage (fault protected by BMU)
Min. cell voltage (fault protected by BMU)
Over temp. (fault protected by BMU)
Max. cell voltage (warning)
Min. cell voltage (warning)
Over temp. (warning)
32
System Status Modbus Holding Registers
Register
Number
15
14
Reserved
Register
Number
40015
40016
40017
40018
40019
40020
40021
40022
40023
40024
288V SCiB Energy Storage System Installation and Operation Manual – 203810-000
Bit Number
13
12
11
10
9
Reserved
Reserved
Reserved
b12 b11 b10 b9
15 14 13 12 11 10 9
Fully charged voltage indicated by 0.1V/LSB (285V)
Cutoff voltage indicated by 0.1V/LSB (215V)
Over charge current value indicated by 0.01A/LSB (40A)
Over discharge current value indicated by 0.01A/LSB (400A)
Max. cell voltage indicated by 1mV/LSB (3.0V)
Min. cell voltage indicated by 1mV/LSB (1.3V)
Fault temp. indicated by 1°C/LSB (75°C)
Max. cell voltage indicated by 1mV/LSB (2.75V)
Min. cell voltage indicated by 1mV/LSB (1.5V)
Fault temp. indicated by 1°C/LSB (55°C)
8
7
6
5
4
Contactor
Host Status
Status
b5
b4
b8
Reserved
b4
Bit Number
8
7
6
5
3
2
1
0
Cabinet ID
b3
b2
b1
b0
b3
b2
b1
b0
b3
b2
b1
b0
4
3
2
1
0
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