User manual

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)

4321

Pin No. Signal Name Pin No. Signal Name

1CD6DSR

2RXD7RTS

3TXD8CTS

4DTR9RI/+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.