Omron NT20S Operation Manual page 73

Connection to a PC by the NT Link (1:N)
RS-232C cable
(max. length: 2 m), or
directly connected
RS-485 cable
RS-232C/RS-422A
converter unit,
type NT-AL001
54
S RS-485 connection
C200HX/HG/HE
OMRON PC
While controlling machinery and
monitoring lines, controls the
NT20S units when necessary.
C200H/HG/HE can be used.
RS-232C/RS-422A
converter unit,
type NT-AL001

RS-485 cable ( ) RS-485 cable (
RS-232C cable RS-232C cable
(max. length: 2 m) (max. length: 2 m)
NT20S
[RS-232C Cable Wiring]
Same as for an RS-422A connection. Refer to "RS-422A connection" (page 52).
[RS-485 Cable Wiring]
S NT-AL001 to NT-AL001
NT-AL001
Abbrev.
Functional
ground
RS-422A
SDB
terminal
block
SDA
RDB
RDA
S PC to NT-AL001
PC
Connector cover
RS-422A
interface
RS-232C/RS-422A
converter unit,
type NT-AL001

) RS-485 cable (
RS-232C cable
(max. length: 2 m)
NT20S NT20S
Pin No.
1
3
4
5
6
Shielding
wire
Abbrev.
SDA
SDB
Shielding
wire
RS-232C/RS-422A RS-232C/RS-422A
converter unit, converter unit,
type NT-AL001 type NT-AL001
 
) RS-485 cable ( )
RS-232C cable
(max. length: 2 m)
NT20S

(
NT-AL001
Pin No. Abbrev.
Functional
1
ground
3 SDB
4
SDA
5 RDB
6 RDA
NT-AL001
Pin No. Abbrev.
Connector
1
cover
3 SDB
4
SDA
Section 2-6
) Total cable length: 500m
RS-422A
terminal
block
RS-422A
terminal
block