Omron NT620S Operation Manual page 65

Connection to a PC by the NT Link (1:N)
NT620S/NT620C or PC
Abbrev.
RS-232C
interface
52
- RS-232C Cable Wiring
Pin No.
Connector
cover
SD 2
RD 3
RS 4
CS 5
+5V 6
SG 9
- RS-422A Cable Wiring (1)
PC or NT-AL001
RS-422A
terminal
block
- RS-422A Cable Wiring (2)
NT-AL001
RS-422A
terminal
block
S RS-485 Cables
When using RS-485 cables, note the following points.
- The wiring for RS-485 cables is always the same regardless of the location.
Follow the instructions below in order to complete the wiring correctly.
- Always set a terminal resistor (terminator) at both ends of the RS-485 cable.
Do not set terminal resistors at any other position.
- When equipment has functional ground terminals, always connect the
shielding of the RS-485 cable to these terminals.
- Always use an RS-232C/RS-422A converter unit (NT-AL001) to make a con-
nection between an NT620S/NT620C and an RS-485 cable.
NT-AL001
Pin No.
2
3
4
5
6
9
Abbrev.
Functional
ground
SDA
SDB
RDA
RDB
Abbrev.
Functional
ground
SDA
SDB
RDA
RDB
Section
Abbrev.
SD
RD
RS-232C
RS
interface
CS
+5V
SG
This connection is not
possible when using
NT620S/620C
NT-AL001
Abbrev.
Functional
ground
RS-422A
SDA
terminal
block
SDB
RDA
RDB
NT-AL001
Abbrev.
Functional
ground
RS-422A
SDA
terminal
block
SDB
RDA
RDB
2-7