Data Access Via Rs-485 Interface; Data Access Using The Bms Protocol; Data Access Using The Modbus Rtu Protocol; Reading Out The Modbus Register From The Isometer - Bender ISOMETER isoCHA425HV Manual

5

Data access via RS-485 interface

5.1

Data access using the BMS protocol

The BMS protocol is an essential component of the Bender measuring device interface (BMS bus protocol).
Data transmission generally makes use of ASCII characters.
BMS channel no.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
5.2

Data access using the Modbus RTU protocol

Requests to the ISOMETER® can be made using the function code 0x03 (read multiple registers) or the
command 0x10 (write multiple registers). The ISOMETER® generates a function-related answer and sends it
back.
5.2.1 Reading out the Modbus register from the ISOMETER®
The required Words of the process image can be read out from the ISOMETER® "Holding Registers" using
function code 0x03. For this purpose, the start address and the number of the registers to be read out must be
entered. Up to 125 Words (0x7D) can be read out with one single request.
Operation value
R
F
R
F
U
n
U
n
Fault location [%]
C
e
Update counter
U
L1e
U
L2e
R
FU
isoCHA425HV_D00404_04_M_XXEN/10.2023
ISOMETER® isoCHA425HV
Alarm
Prewarning R1
Alarm R2
Undervoltage
Overvoltage
Connection fault, earth (E.01)
Connection fault, system (E.02)
All other device faults (E.xx)
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