Omron SYSMAC CV500-BSC11 Operation Manual page 168

Hardware Interfaces
Connection Example
Host computer RS-232C
Pin Pin
no. no.
1 1
2 2
3 3
RS-232C
4 4
interface
5 5
6 6
7 7
8 8
20 20
Shield
wire
Trans-
mission
Recep-
tion
Turn ON the internal termination resistance (220 Ω) by using the DIP switch (pin 4) on the front panel.
Setting Link Adapters
Turn ON the internal termination resistance (220 Ω). To keep ON the CTS (clear to send) signal, set the Link Adapt-
er to 0 V. To receive the CTS signal from an external source, set to external. The Link Adapter is usually set to 0 V.
Note 1. Connect only one end of the shield to FG so that no current flows through the shield. To connect the
BASIC Unit with a Link Adapter, connect the shield of the BASIC Unit to FG. To connect the shield to FG,
connect it to pin 7 of the connector or to the connector hood.
2. Be sure to cap all unused optical connectors. Errors will occur due to external light disturbances if un-
used connectors are left open.
Multidrop Connection, Example 1
In a multidrop connection, more than one RS-422 device can be connected to one BASIC Unit.
BASIC Unit (CV500-BSC11/21)
162
Sym-
bol
FG
OR/
SD
selec-
RD
tion
RS
0 V
circuit
CS
DR Outer
connection
SG
CTS
CD
selection
0 V
ER
0 V
Link Adapter 3G2A9-AL004-(P)E
Link Adapter
3G2A9-AL001
RS-422
Pin Sym-
no. bol
9 SDA
5 SDB
6 RDA
1 RDB
3 SG
7 FG
0 V
Termination resistance
5 V
24 V
Fuse
Temperature Controllers (RS-422 compatible)
Link Adapter
3G2A9-AL001
Appendix C
BASIC Unit
CV500-BSC11/21
Shield
wire Sym- Pin
bol no.
SDA 9
SDB 5
Port 3
RDA 6
RS-422
RDB 1 Interface
NC 3
FG
7
See Note 1.
200
VAC
AC power
supply
100
VAC
LG
Ground (for the
FG
Link Adapter only)