User Manual

PL3000 Series Hardware Manual

3-10

3.3 Interface Specifications

This section describes the specifications of each interface of the PL Series unit.

 Serial Interfaces

 Serial Interfaces (COM1)

This interface is used to connect an RS-232C/RS-422/RS-485

serial cable. A D-sub 9-pin plug connector is

used.

RS-232C

• This PL unit’s serial port is not isolated. Always connect the #5 SG (Signal

Ground) of the PL unit to the connected device, especially if the connected device

is also not isolated. Failure to do so may damage the RS232C/RS4 22/RS485

circuit.

• The SG (signal ground) and FG (frame ground) terminals are connected

internally in the PL unit. When connecting the SG line to another device, be sure

that the design of the system/connection does not produce a shorting loop.

• Connect FG terminal line to housing.

• Do not connect any pins to COM1 [NC].

*1 To change the communication method, set the DIP switch located on the circuit board in the PL

unit to the desired position. The factory setting is RS-232C. Please refer to “3.4 Internal Switch-

es Specifications” (page 3-16).

*2 To change the CI (RI)/+5V setting of pin #9, set the slide switch located on the circuit board in

the PL unit to the desired position. Please refer to “3.4 Internal Switches Specifications” (page

3-16).

Interfit Bracke t #4-40 (UNC)

Pin Arrangement Pin No.

RS-232C

Signal Name Direction Description

1 CD Input Carrier Detect

2 RD(RXD) Input Receive Data

3 SD(TXD) Output Send Data

4 ER(DTR) Output Data Terminal Ready

5SG

Signal Ground

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 Input/

Called status display

+5V Output 0.5A

Shell FG

Frame Grou nd

(Common with SG)

(PL unit sid e)