Serial Interface Specifications COM2

Introduction

This interface is used to connect the HMIGXO series to the remote equipment, via an RS-422/485 cable. The connector used is a D-Sub 9-pin male connector.

By using a long PLC cable to connect to the panel, it is possible that the cable can be at a different electrical potential than the panel, even if both are grounded.

The panel’s serial port is not isolated. The SG (signal ground) and the FG (functional ground) terminals are connected inside the panel.

DANGER

ELECTRIC SHOCK

oMake a direct connection between the functional ground (FG) terminal and ground.

oDo not connect other devices to ground through the functional ground (FG) terminal of this device.

oInstall all cables according to local codes and requirements. If local codes do not require grounding, follow a reliable guide such as the US National Electrical Code, Article 800.

Failure to follow these instructions will result in death or serious injury.

Serial Interface COM2

The following table describes the serial interface with a D-Sub 9-pin connector via an RS-422/485 cable.

Pin	Signal Name	Direction	Meaning
1	RDA	Input	Receive Data A (+)
2	RDB	Input	Receive Data B (-)
3	SDA	Output	Send Data A (+)
4	ERA	Output	Data Terminal Ready A (+)
5	SG	–	Signal Ground
6	CSB	Input	Send Possible B (-)
7	SDB	Output	Send Data B (-)
8	CSA	Input	Send Possible A (+)
9	ERB	Output	Data Terminal Ready B (-)
Shell	FG	–	Functional Ground (Common with SG)

Any excessive weight or stress on communication cables may disconnect communication with the equipment.

CAUTION

LOSS OF POWER

oMake sure all connections to the communication ports on the bottom and sides of the panel do not put excessive stress on the ports.

oSecurely attach communication cables to the panel or cabinet.

oUse only D-Sub 9 pin cables with a locking system in good condition.

Failure to follow these instructions can result in injury or equipment damage.