Temperature Controller Settings - Omron NV Series Setup Manual

Connecting to EJ1 Temperature Controllers Using Modbus-RTU
6-5-2

Temperature Controller Settings

Setting and Transfer
Procedures with CX-
Thermo or EJ1 Front-
panel DIP Switch Settings
COM port Bit Rate
(for connec-
tion with
PLC and
Data Length
external
Stop Bits
devices)
Parity Bit
Communica-
tions Error
Handling
Note When connecting to OMRON EJ1 Temperature Controllers using Modbus-
RTU, set a transmission delay of at least 5 ms in the communications parame-
ters in the NV Configuration of the PT. Communications may not be performed
correctly if a transmission delay of 4 ms or less is set. Use a value of the least
5 ms (default) for the port B send wait time in the EJ1. Communications may
not be performed correctly if a send wait time of 4 ms or less is set.
Use the CX-Thermo Support Software to set the communications protocol,
baud rate, communications data length, communications parity, and sent wait
time.
Changes in these set values will not be valid the Temperature Controller is
reset or the power supply is cycled.
■ EJ1 System Settings
Item
Serial Port Tab Page Baud Rate
*1 The communications unit number can be set to between 1 and 63 for the
NV4W or NV3Q.
It is not necessary to set the communications data length and stop bits for port
B.
Make the following settings on in NV-series PT.
Parameter
Data Length
Stop Bits
With EJ1 version 1.2 or higher, the communications protocol and baud rate
can be set using DIP switch SW2.
Item
9,600, 19,200,
38,400, 57,600, or
115,200 bps
8 bits
Always 1 bit
Even or odd
Retry Number of times
and number of
seconds
Display Error OFF, ON (held), or
Codes ON (not held)
Transmis- 5 to 1,000 ms
sion Delay
Parameter
Parity
Communications Unit No.
Communications Protocol
Send Wait Time
Setting
8 bits
1 bit (Cannot be changed.)
Section 6-5
Settings Remarks
These settings
must be the same
as the communica-
tions parameter set
for the EJ1 Temper-
ature Controller.
Setting
Set to 9,600, 19,200, 38,400,
57,600, or 115,200 bps.
Even or odd. (Do not select
"none.")
*1
Set to 1 to 63.
Set to Modbus-RTU.
0 to 99 ms
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