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 connect any pins to COM2 [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. Failure 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
Direction
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
9
CI(RI)/+5V
*1
*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)
9
6
5
1
(PS-A side)
