Dräger REGARD 7000 - Modbus Command Structure and Data Types

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Annex
14.3 Modbus command structure
14.3.1 Example: Read register
Starting at input register 3701 (decimal) the two measured values of the REGARD
7000 channels 1 and 2 that are contained in four consecutive Modbus registers are
read.
Query to the REGARD Modbus RTU Gateway
Response from the REGARD Modbus RTU Gateway
In the displayed response, both measured values are NaN (Not a Number).
All values hexadecimal.
14.3.2 Example: Write register
Writing the value 0 into the holding register 100 (decimal) acknowledges all
acknowledgeable alarm, fault and warning states of a linked REGARD 7000
system.
Query
The REGARD Modbus RTU Gateway reflects the query as the answer.
NOP No Operation
A channel with a NOP channel ID is inactive and is not dis-
played.
PLC Programmable Logic Controller
SCADA Supervisory Control and Data Acquisition
SFR System Fault Relay
SIL Safety Integrity Level, (safety requirement level according to
IEC 61508 and/or EN 50402).
SSR Special State Relay
Abbreviation Explanation
Slave
Addr.
Func.
Code
Start
Register
Register
count
CRC
01 04 0E 74 00 04 B3 3B
Slave
Addr.
Func.
Code
Byte
count
Register
3701 value
Register
3702 value
Register
3703 value
Register
3704 value
CRC
01 04 08 00 00 7F C0 00 00 7F C0 0F B3
Slav
e
Addr.
Func
.
Code
Start
Register
Value CRC
01 06 00 63 00 00 79 D4