Validating The Modbus Protocol Communication; Testing Communication Between Computer And Gateway System - HPE GL10 User Manual

8. Install the top access panel.
9. Connect the drive cables.
10. Install the bottom access panel.
11. Mount the gateway on page 10.
12. Power up the gateway on page 9.

Validating the MODBUS protocol communication

You can use the following tests and methods to validate MODBUS protocol communication:
• Computer-Gateway communication test
• Computer-solar sensor communication test
• Gateway-solar sensor communication test

Testing communication between computer and Gateway system

Procedure
1. Install the USB to RS485 adaptor driver.
A virtual serial port opens and displays the following message:
"Prolific USB-to-Serial Comm Port (COM5)."
For information on pin connector assignments, see DB9 connector pin assignments for RS485.
2. Route the cables:
a. Connect the Data+ to RX+ and RX+ to TX+ cable with a 120 ohm resistor in-between.
b. Connect the Data- to RX- and RX- to TX+ cable with a 120 ohm resistor in-between.
The serial port is configured with the following parameters:
• Speed: 9600
• Data bits: 8
• Stop bits: 1
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