114
Connecting to the Host’s RS-422A/485 Port
Section 5-2
Note
One end of the wire must always be connected to the host (PC), and there must be
no branching. Branching will cause problems such as transmission delays and
communication failures.
NT31
NT31C
PC
PC
NT31
PC
NT31C
NT31C
NT31
NT31
NT31
NT31
NT31
(At termination)
Relay terminal block
Relay terminal block
Max. 2 m
(Not at
termination)
(Not at
termination)
(Not at
termination)
(At
termination)
Example of Good Connection
Examples of Bad Connections
Reference: CS1 series CPUs cannot be connected with the 1:1 connection NT link method.
Use the 1:N connection NT link method instead to make the 1:1 connection. For
details, refer to “Using the NT link (1:N) Method” (page 127)
5-2-1
Host Types and Settings
The types of host that have an RS-422A port and can be connected to the
RS-422A/485 port of the NT31/NT31C, and the settings to be made at the host,
are described here.
When Using the Host Link Method
Compatible host units
Some models and series of OMRON PCs have the RS-422A/485 type host link
function built in. In a CS1 series, the host link method can be used by installing a
serial communication board. In addition, some C200HX/HG/HE (–Z) devices
have an integral CPU that can be connected in the host link method by installing
a communication board.
Check the model and series of the PC, the type of the installed serial commu-
nication board, the serial communication unit, and host link unit at the connection
end before making a connection.
The host units featuring the RS-422A/485 type host link function and can be con-
nected to the RS-422A/485 port of the NT31/NT31C are indicated in the table
below.
Summary of Contents for NT31 Series
Page 1: ...Cat No V043 E1 2 Programmable Terminal NT31 31C OPERATION MANUAL...
Page 2: ...iii NT31 31C Programmable Terminal Operation Manual Produced March 1999...
Page 41: ...30 Before Operating Section 1 5...
Page 75: ...64 Using a Memory Unit NT31 NT31C without V1 Section 3 6...
Page 160: ...149...
Page 174: ...163...
Page 193: ...182...
Page 211: ...200...
Page 235: ...224 c Return to the screen on which screens are specified...
Page 262: ...251...
Page 360: ...349 It is not possible to control a gloval window by touch switch operation...
Page 468: ...457 254 255 0 2 7 1 4 5 3 3 0 0 0 5 9 8 0 3...
Page 476: ...465 Special Functions Section 7 16...
Page 495: ...484 OFF...
Page 610: ...599 Commands Responses Section 9 3...
Page 630: ...619 Examples of Actual Applications of Memory Link Section 10 2...