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4-1
Section
Connecting to the RS-232C Port at the Host
63
The following table shows the words allocated in the DM Area and the settings.
Word m = D 100
×
unit number
Allocated DM word
Value
Settings
Port 1
Port 2
Value
Settings
m
m+10
8200
1:N NT Link mode
m+1
m+11
000A
Communications baud rate (high-speed)
m+6
m+16
000
j
j
= The largest model number of the
connected PT (0 - 7)
In the memory link method, the connection can be made to a personal computer
with RS-232 and an FA computer, etc.
When connecting to the host in the memory link method, it is necessary to create
a program for the memory link at the host side.
The following are the communication conditions that can be used in the memory
link method. For the host (a personal computer, an FA computer, etc.), its setting
should be compatible to one of the communication conditions listed in the follow-
ing table. Set the same communication conditions at the NT21 by the memory
switch. (page 132).
Item
Settings at the host
Input/Output port
RS-232C
Baud rate
1,200, 2,400, 4,800, 9,600, 19,200, or 38,400 bps.
Data bits
7 bits, 8 bits
Stop bits
1 bits, 2 bits
Parity
None, even, odd
Flow control
None, RS/CS, XON/XOFF
4-1-2 Connecting Directly between RS-232C Ports
The method for connection between the RS-232C ports of the NT21 and the host
is described here.
Recommended Connector Cable
When making the connector cable, as far as possible use the recommended
connectors, connector hoods, and cables indicated in the table below. Some
Units come supplied with one connector and one connector hood.
Check the required components and prepare them in advance.
Name
Model
Remarks
Delivered with
Connector
XM2A-0901
9-pin
Made by OMRON
CS-series CS1G/CS1H,
CS1G-H/CS1H-H
CJ-series CJ1G
C-series CQM1,
C200HS,
C200HX/HG/HE(-Z)E,
CVM1/CV-series CPU
Units
CV500-LK201
XM24-2501
25-pin
Made by OMRON
CV500-LK201
C200H-LK201-EV1
When Using the Memory
Link Method