
PS-2000B Series User Manual
1–7
Chapter 1 – PS-B Unit Basics
1.4
Interfaces
1.4.1 RS-232C Interface (COM1/COM2/COM3/COM4)
9
8
7
6
5
4
3
2
1
Pin No.
Signal Name
Pin No.
Signal Name
1
CD
6
DSR
2
RXD
7
RTS
3
TXD
8
CTS
4
DTR
9
RI/+5V
5
GND
FG
FG
D-sub 9-pin (Male)
Screw Size: (4-40), Inch type
•
The GND terminal is the signal ground. Be sure to connect the GND
terminal with the SG (signal ground) terminal of the opposite side's
connector.
•
The FG and SG terminals are connected inside the PS-B unit. When
connecting another device to the PS-B, design your system so that it
will form SG short-circuit loop.
Pin No. 9 "+5V/RI" changeover is available only with COM1 and COM3. COM2
and COM4 are fixed to RI. To change the COM1 or COM3 setting from +5V to
RI or vice-versa, remove the main unit cover and slide the +5/RI changeover
switch to the desired setting. The factory setting is RI.
RI
+5V
For COM3
+5V/RI Changeover Switch
PS-B Internal View
For COM1
•
Be sure to check the interface specifications of the opposite side's con-
nector before changing this setting. Incorrect settings can result in a
malfunction or unit damage.
•
Be sure to turn the PS-B unit OFF prior to changing internal settings to
prevent a malfunction.