Proface APL3000B - Node Box PC - Manual (Page 29)

PS-3710A Series Hardware Manual
2-8
2.1.3 Interface Specifications
This section describes the specifications of each interface of the PS-3710A Series unit.
„ Serial Interface (COM1,COM2,COM3,COM4)
The PS-A unit side connector is a D-Sub 9 pin plug type.
‹ COM1,COM2,COM4
Interfit Bracket #4-40 (UNC)
• Do not connect any pins to COM3 [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 2-11) for details.
Input / Output
Called status display / +5V
Output (Switching available)
(Fixed “RI” for COM4)
FG FG -
Frame Ground
(Common with SG)
9
6
5
1
(PS-A side)