Instruction Manual

ST3000 Series Hardware Manual

3-10

 Serial Interface (COM2)

This interface is used to connect an RS-485 (MPI only) serial cable. A D-Sub 9-pin socket connector is used.

ST Connector XM3B-0942-502LX <OMRON Co.>

Interfit Bracket #4-40 inch screws are used.

Recommended Cable Connector XM2A-0901 <OMRON Co.>

Recommended Cable Cover XM2S-0913 <OMRON Co.>

Recommended Jack Screw XM2Z-0073 <OMRON Co.>

Arrangement

Pin No.

RS-485 (MPI only)

Signal Name Direction Meaning

1NC- -

2NC- -

3LINE(+)

Input/

Output

LINE(+)

4 RS(RTS) Output Request to Send

5 SG - Signal Ground

*1. The SG and FG terminals are isolated.

6 5V - 5V External Output

*2. The 5V output for Pin # 6 is not protected against overcurrent. To prevent damage or

unit malfunctions, use only the rated current.

*3. When providing power via the Siemens Co.’s PROFIBUS connector, power cannot

be connected to the Device/PLC.

7NC- -

8LINE(-)

Input/

Output

LINE(-)

9NC- -

Shell FG -

Frame Ground

(Common with SG)

(ST unit side)