Omron Programmable Terminals NT631 Setup Manual page 122

Connecting to the Host's RS-422A/485 Port
Serial Communications Board Switch Settings
Set the switches on the Serial Communications Board as shown below.
2-wire or 4-wire selector (WIRE):
Terminating resistance switch (TERM): ON (terminator ON = terminating
Allocation DM Area Settings for CPU Unit
Settings are written from the Programming Device (a Programming Console
or CX-Programmer) directly into the allocation DM area (system setting area)
of the CPU Unit. After the settings are written, they become effective by turn-
ing the power ON, restarting the Unit, restarting the communications port, or
executing the STUP command.
In the following, the channel numbers of the allocation DM area and the set-
tings are shown.
Allocated DM Setting
Area words
Port 2
DM32010 8000
DM32011 0000
0007
DM32012 0000
DM32013 0000
Connecting to a CS/CJ-series Serial Communications Unit
CS/CJ-series Rack-mounting Units:
CS1W-SCU31-V1 (Port 1 and port 2 are both RS-422A/485 ports.)
CJ1W-SCU31-V1 (Port 1 and port 2 are both RS-422A/485 ports.)
CJ1W-SCU41(-V1) (Port 1 is an RS-422A/485 port.)
Setting the Front Switches
Set the unit number of the Serial Communications Unit using the rotary
switches on the front of the Unit. Set the number or symbol in the setting dis-
play window in the following way using a flat-blade screwdriver. When using a
CS/CJ-series Serial Communications Unit set the switches as shown below.
2-wire or 4-wire selector (WIRE):
Terminating resistance switch (TERM): ON (terminator ON = terminating
DM Area Allocation Settings
From the Programming Device (i.e., a Programming Console or CX-Program-
mer), write the settings directly to the CPU Unit's DM Area Setup Area. After
the settings have been written, they will be enabled when the power supply is
cycled, the Unit is restarted, the communications port is restarted, or a STUP
instruction is executed.
The DM Area words that are allocated and the contents of the settings are
given in the following table.
(4-wire = RS-422A)
4
resistance enabled).
Setting Contents
Host link mode, 2 stop bits,
data length 7 bits, even parity,
Communications speed: 9600 bps
Communications speed:19200 bps
Transmit delay time0 ms.
No CTS control Unit, No.0 for host link
(4-wire = RS-422A)
4
resistance enabled).
Section 5-2
105