ABB CSU-2LV, Installation And Maintenance Manual, Page: 64 / 84

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ABB
ARC GUARD SYSTEM™ – CSU-2LV/2MV INSTALLATION AND MAINTENANCE GUIDE
6.7 Troubleshooting
6.7.1 Visual diagnostics
The yellow Com LED flashes when a Modbus request is
received.
6.7.2 Practice via modpoll [3]
Using the application modpoll [3] from a windows
environment, it is easy to communicate with CSU-2. To
read the status of CSU-2 unit, do the following:
1. Download modpoll from [3]
2. Connect CSU-2 to a PC with a USB-RS485 adapter
3. Configure Modbus RTU according to the existing
network. In the example, we choose Modbus ID =
5, Baud rate = 19200 and Frame format is 8 bits,
even, stop 1.
4. Execute modpoll from command prompt:
modpoll -m rtu -0 -a 5 -r 0x64 -c 1 -t 4 -b 19200 -d 8
-s 1 -p even -l 100 COM9
INFORMATION
According to “6.6.3.1 System status” on
page 49
, system status can be read with
address 0x64. A USB-RS485 adapter is used for
Modbus RTU communication, and it is connected
to USB serial port COM9.
Figure 35
Example for Modbus RTU connection with modpoll as master
1SFC170020M0201
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