Programmable Serial-to-Ethernet Device Server
PDS Series User Manual, Version 2.5, Mar. 2019
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6.
Modbus Testing and Protocol
The PDS series module 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 series is operating
correctly.
Note: Starting from the firmware version v3.3.01.4 [Apr. 12 2016], the DS-700 and PDS(M)-700(D)
series modules support Modbus Gateway function.
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 series.
1.
Keep up network connection and power on status for your PDS series. Refer to
“Setting up the PDS Series Module”
2.
Connect the Modbus device (e.g. M-7022, optional) to the PDS series on COM2 (RS-485
bus) for self-test. Refer to
3.
Supply power to the Modbus device (M-7022, Device ID: 2, +10 to +30 V
DC
Power used).
Refer to Figure 6-1 to 6-2 for an illustration of how to perform the above steps.
Figure 6-1: DS-700/PDS(M)-700(D)/PPDS(M)-700(D)-MTCP/PDS-5105D-MTCP series.
RS-485 Wiring
Power Supply
