Connections; Cpu Connections - Omron SYSMAC CV Series Operation Manual

RS-422 Connections
Line Connections
3-5 RS-422 Connections

3-5-1 CPU Connections

Specifications
The following diagram shows the connections between the host computer and
the Host Link Unit. When RS-232C cable is used, a host computer can be con-
nected to only one PC.
Host Pin number
Link
25-pin
Unit
Connector Connector
hood 1 hood
7
2
3
4
5
8
Note 1. It is not necessary to connect these terminals before connecting the host
computer to the Host Link Unit as long as the CTS selector is turned ON.
2. The RS and CD terminals must be connected when connecting the host
computer to the Host Link Unit using half-duplex communications.
3. Ground the FG terminals of both the PC and the host computer to a a resis-
tance of 100 Ω or less. For details refer to the CV-series PC Installation
Guide and your host computer manual.
4. Connect the Host Link Unit to the FG terminal of the host computer via the
shield wire.
Electrical characteristics:
Direction of signal connection: Viewed from the PC.
Maximum cable length:
Host interface
pin No.
Connector hood
1
2
6
8
4
5
9-pin Signal
FG
9 SG
2 SD
3 RD
4 RS
*1
5 CS
7 CD
Conforming to EIA RS-422
500 m total
Signal
Frame ground FG
Send data A SDA (SD–)
Send data B SDB (SD+)
Receive data A RDA (RD–)
Receive data B RDB (RD+)
Request to send RS
Clear to send CS
1
5
Section 3-5
Host computer
FG
SG
SD
RD
RS
*2
CS
CD
Shield
Symbol Direction of signal
---
Output
Output
Input
Input
Output
Input
6
9
31