Modbus Testing And Protocol - ICP DAS USA PDS-220F Series User Manual

Programmable Serial-to-Fiber Device Server

6. Modbus Testing and Protocol

The PDS-220Fx can works as a Modbus TCP to RTU/ASCII gateway that supports most SCADA/HMI
communications based on the Modbus/TCP protocol. This chapter provides detailed information
about the Self-Test process, which is used to confirm that the PDS-220Fx is operating correctly.
Here, the M-7022 module is used as an example. For other Modbus RTU device or third party
Modbus RTU device, refer to the specific Quick Start Guide or User Manual for that Modbus RTU
device. Follow the procedure described below:

Step 1: Connect the Modbus device to the PDS-220Fx.
1. Keep up network connection and power on status for your PDS-220Fx. Refer to
"Setting up the PDS-220Fx"
2. Connect the Modbus device (e.g. M-7022, optional) to the COM2 (RS-485 bus) on PDS-220Fx for
self-test.
3. Supply power to the Modbus device (M-7022, Device ID: 5, +10 to +30 V
for more details.
RS-485 Wiring
PDS-220Fx Series User Manual
Power used).
DC
Power Supply

Version 1.3, Oct. 2018
Chapter 3
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