User Manual

Chapter 2 Specifications

2-27

2.2.3 Interface Specifications

This section describes the specifications of each interface of the PS-3711A Series unit.

 Serial Interface (COM1,COM2)

The PS-A unit side connector is a D-Sub 9 pin plug type.

 COM1

Interfit Bracket #4-40 (UNC)

• Do not conne c t an y pi n s t o CO M2 [NC ] .

• Connect the FG terminal line to the shell.

• Always connect the #5 SG (Signal Ground) of the PS-A unit to the connected

device, especially if the connected device is also not isolated. Fa ilure to do so

may damage the RS232C/RS422/RS485 circuit.

• FG and SG terminals are internally connected in the PS-A. When connecting to

another device, be sure not to create an SG shorting loop in your system.

Pin Arrangement Pin No.

RS-232C

Signal Name Directi on Meaning

1 CD Input Carrier Detect

2 RD(RXD) Input Receive Data

3 SD(TXD) Output Send Data

4 ER(DTR) Output Data Terminal Ready

5 GND(SG) - Signal Ground (SG)

6 DR(DSR) Input Data Set Ready

7 RS(RTS) Output Request to Send

8 CS(CTS) Input Clear to Send

9CI(RI)/+5V

*1 To change the RI/+5V setting of #9 pin, open the PS-A unit's rear cover and set

slide switch to the desired position.

Please refer to  Switches (page 2-30) for details.

Input / Output

Called status display / +5V

Output (Switching available)

FG FG -

Frame Ground

(Common with SG)

(PS-A side)