Specifications

PL-6930 / PL-7930 Series User Manual

2-12

2.3 Interface Specifications

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

2.3.1 Serial Interfaces (COM1/COM2/COM3/COM4)

This interface is used to connect an RS-232C (serial) cable. A D-sub 9pin plug connector is used.

Number 9 pin's [RI/+5V]changeover is good only for COM2 and COM3. The factory default setting is

[RI]. For COM1 and COM4, [RI] can be available.

Use #4-40 (UNC)

fixing clamps to fix the joint of the interspace.

• The PL unit’s serial port is not isolated. When the host (PLC) unit is also not

isolated, be sure to connect the #5 SG (Signal Ground) terminal to reduce the risk

of damaging the RS-232C circuit.

• Inside the PL unit, the SG (Signal Ground) and FG (Frame Ground) terminals are

connected.

• If you connect an external device to the PL using the SG terminal, make sure that

no short-circuit loops are formed in the system design proceedings.

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 SG(GND) - Signal Ground

6 DR(DSR) Input Data Set Ready

7 RS(RTS) Output Request to Send

8 CS(CTS) Input Send Available

9 CI(RI)/5V Input/Output

Called status display/+5V Output

(Switching available*

)

FG FG -

Frame Ground

(Common with SG)

• The ground (GND) is a signal ground. Make sure to connect it with the other unit’s

SG (Signal Ground) pin.

• The COM4 is not allowed to use when the communication procedure to the Touch

Panel is applied to a COM port connecting.