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4.4.5
Import of data via Modbus (USM GT400 is Master)
USM-GT-400 gets the gas data via Modbus. It is Modbus master and asks contin-
uously if new data are available. In this case, all the components are re-read and
fed to the AGA-10 calculation. Parameter AX-10 "Modbus Master Target" sets
which device the USM-GT-400 is addressing. If the GC9300 is chosen no Modbus
register needs to be set at AZ-01 to AZ-54 for status and part of the gas compo-
nent.
1. Parameter AX-07 "maximum timeout":
Time [minutes] in which a new telegram must have come via RMGBus.
2. Adjustment of the parameter of serial port 2
J-26 "baud"
J-27 "bits"
J-28 "parity"
3. Modbus configuration:
J-29 "Modbus-protocol 2"
Master has to be set to "RTU" or "ASCII"
J-30 Modbus-2 HW-mode
Hardware configuration can be selected as RS232 or RS485
J-31 "Modbus-address 2"
Slave-address of the device with the gas data
4. Parameter AX-01 "AGA-10 source":
"Serial Port 2"
4 Functional principle – Ultrasonic-flow measurement
Fig. 4.6: Import of data via Modbus
Manual USM GT400 · EN10 · May 2021
47
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