Omron CQM1H-SCB41 Operation Manual page 86

Connections
Port Configuration
RS-422A/485 1:N
Connection Examples
Connecting RS-232C
Ports 1:1
Note 1. The maximum cable length for RS-232C is 15 m.
2. The maximum combined cable length for RS-422A/485 is 500 m including
branch lines.
3. The maximum cable length is limited to 2 m when an NT-AL001-E Link
Adapter is connected.
4. Branch lines must be a maximum of 10 m long.
5. Up to 32 nodes can be used for 1:N connections. With a 2-wire connection,
this figure includes the Communications Board itself, whereas with a 4-
wire connection, it does not (i.e., up to 32 devices can be connected).
The connection examples in the remainder of this section show only the basic
connection diagrams. We recommend that appropriate noise countermea-
sures be taken in actual applications, including the use of shielded twisted-
pair cables. Refer to 2-3 Wiring for actual wiring methods.
Connections to E5CK Controller
Serial Communications
Board
Signal
RTS
CTS
DSR
DTR
D-sub, 9-pin
connector (male)
Schematic diagram
RS-422A/485
Resistance
ON
RS-422A/485
Resistance
ON
Resistance
ON
RS-422A/485
Resistance ON
5-V power
RS-232C
Pin
Shield
FG
SD
RD
SG
RS-422A/485 interface
Resistance ON
RS-422A/485 interface
3G2A9-AL001
Resistance ON
RS-232C interface
NT-AL001-E
RS-232C
RS-232C
RS-232C
OMRON E5CK Controller
Terminal Signal
SD
RD
SG
Terminal block
Section 5-4
71