Instruction Manual

ST3000 Series Hardware Manual

3-20

 Serial Interface (COM2)

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

serial cable. A D-Sub 9-pin plug connector is used.

*1 RS-485 is compliant with AST-3301B / AST-3301S with revision code "B" or later. For all other models,

all revisions support RS-485.

About Revision (page 12)

ST Connector XM2C-0942-502LX <OMRON Co.>

Interfit Bracket #4-40 inch screws are used.

Recommended Cable Connector XM2D-0901 <OMRON Co.>

Recommended Cable Cover XM2S-0913 <OMRON Co.>

Recommended Jack Screw XM2Z-0073 <OMRON Co.>

Arrangement

Pin No.

RS-422/RS-485

Signal Name Direction Meaning

1 RDA Input Receive Data A(+)

2 RDB Input Receive Data B(-)

3 SDA Output Send Data A(+)

4 ERA Output Data Terminal Ready A(+)

5 SG - Signal Ground

6 CSB Input Send Possible B(-)

7 SDB Output Send Data B(-)

8 CSA Input Send Possible A(+)

9 ERB Output Data Terminal Ready B(-)

Shell FG -

Frame Ground

(Common with SG)

SEE

(ST unit side)