1.Please remove the HDD and check the DIP switch setting, we can refer to the information in the following picture.

The default setting of COM2 is RS-485/422.

2.After setting the DIP switch to RS485 mode, please enable "RS485 Auto Flow" in BIOS.

3.HMIPSPS752D1X01 is a product of Easy Line Harmony Panel iPC. The port definition of HMIPSPS752D1X01 is different with HMIPSP S-Panel PCs, so user can’t refer to the manual of HMIPSP S-Panel PCs.

Here is the Pin connection of HMIPSPS752D1X01 COM2, user can connect to Pin 3 and Pin7 for RS485 Modbus RTU communication.

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