Direct Connection Between Rs-422A Ports At Both Units - Omron Programmable Terminals NT631 Setup Manual

Connecting to the Host's RS-422A/485 Port
5-2-2

Direct Connection between RS-422A Ports at Both Units

Connecting an NT631/NT631C and Host (RS-422A)
The following are the communications conditions that can be used with the
memory link method. For the host (a personal computer, an FA computer,
etc.), its setting should be compatible to one of the communications condi-
tions listed in the following table. Set the same communications conditions at
the NT631/NT631C by the memory switch. (page 160).
Item
Input/Output board
Communications speed
Data bits length
Stop bits length
Parity
Flow control
The connection method in which the RS-422A ports of an NT631/NT631C
and a host are connected is described here.
NT631/NT631C
R E S E T
R D A
TR M
R D B
S D A
S D B
C S A
C S B
2 4V
PR I N TER PORT B PORT A
+D C
Serial port B
(RS-422A/485, terminal block)
RS-422A cable with connectors (max. length: 500 m)
NT631/NT631C
Wiring When Connecting a C-series Host Link Unit or CPM1 (Host Link)
Applicable Units:
C200H-LK202-V1
3G2A5-LK201-EV1
C500-LK203
3G2A6-LK202-EV1
NT631/NT631C side
RDA
Abbreviation
TRM
RDA (-)
RDB TRM
RDB (+)
SDA
RS-422A/
SDA (-)
485
terminal
SDB (+)
SDB
block
RSA (-)
RSA
RSB (+)
Functional
RSB
ground
24V
+DC
For details on handling shield wires, refer to 5-2-8 Handling the Shield on RS-
422A/485 Cables on page 125.
Setting at Host
RS-422A
1200, 2400, 4800, 9600, 19200, 38400 bps.
7 bits, 8 bits
1 bit, 2 bits
None, even, odd
None, XON/XOFF
Host Link Unit, CPU Unit,
Communications Unit/Board
RS-422A
PLC side
Short-circuit tool
Abbreviation
Pin number
Shielding wire
Connector
FG
hood
1
RDB (+)
−
2
3 SG
−
4
SDB (+)
5
6 RDA (-)
FG
7
−
8
Functional
9
ground
(9-pin type)
Section 5-2
SYSMAC
CS/CJ-series PLC,
C-series PLC,
CVM1/CV series
PLC, SRM1
9-pin connector or
25-pin connector
Host
1
RS-422A
terminal
block
5
115
6
9