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7 Construction and Planning
7.5 Flow computer
If required, you can connect one or two flow computers to the device.
Follow the installation guidelines of the flow computer:
93
Observe the installation instructions for the flow computer
The 2 interfaces RS485-1 and RS485-2 have the same features and you may
change in the following1 to 2 (and 2 to 1) freely.
However, the RS 485-1 (in contrary to the RS 485-2) does not permit a parameter-
izable byte sequence for the data types Long and Float. We therefore recommend
that you use the RS 485-1 for the DZU protocol and the RS 485-2 for instance F
communication. You may find more information in chapter 8.3.
Flow computer from RMG
The device is compatible with the following flow computer series from RMG:
• ERZ 2000NG
• ERZ 2400
If you want to use the flow computer from RMG specified above, you do not have
to carry out any configurations. The flow computers from RMG can directly pro-
cess the protocol of the ultrasonic gas meter from RMG directly. For this purpose,
the flow computer has to be connected to the digital interface RS485-1 in order to
allow all diagnosis functions to be used. If you want to install an additional flow
computer for reasons of security, this must be connected via the interface
RS485-2.
Flow computer from third party manufacturer
Flow computers from third-party manufacturers can be connected to the device.
These can only be connected to the digital interface RS485-2. This interface com-
municates via a Modbus protocol. In order to be able to use all diagnosis func-
tions, the Modbus must be configured. You can also use the high-frequency out-
puts pulse 1 and 2. When parameterizing, take care that the maximum possible
gas flow rate correlates to a maximum frequency of 2 kHz. All diagnosis functions
cannot be used via this interface. If you are using a third-party manufacturer de-
vice, you have to configure the flow computer
.
Manual USM GT400 · EN10 · May 2021
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