Omron Programmable Terminals NT31 NT31C Setup Manual page 71

Connecting to the RS-232C Port at the Host
Connecting to a CS1-series Serial Communication Unit
60
*2 The 1-to-N setting enables BCC (Block Check Character). It is not actually
possible to connect more than one NT31/NT31C in a single host link.
Set the CPU bus unit settings directly from a Programming Device (e.g. SYS-
MAC support software).
For details on the CPU bus unit settings, refer to the SYSMAC CVM1/CV-series
Host Link Unit Operation Manual (W205-E1-j).
Setting the Front Switches
Communications port 1
(RS-232C)
Communications port 2
(RS-232C/RS-422A)
I/O port selector switch
RS-232C
RS-422A
CS1 series Backplane mounted type: CS1W-SCU21
Setting the Front Switches
Set the unit number of the serial communication unit by using the rotary switch
located on the front panel. Set each switch with a flat blade screwdriver so that
the values or symbols in the setting value window agree with the following.
SCU21
RUN RDY
ERC ERH
SD1 SD2
RD1 RD2
UNIT
F E
1 0
No.
C
@ Unit # (SW3, SW4)
When using communication port 2, set these
switches to 0.
@ I/O port selection (selector switch)
Set this to RS-232C.
@ CTS selection (DIP SW2 and SW3)
Set SW2 or SW3 to ON. (Set this always to 0V.)
To use communication port 1, set SW2. To use
communication port 2, set SW3.
@ Communication condition setting (DIP SW1)
Set this switch to OFF.
Communication is executed in accordance with the
CPU bus unit system settings made at the PC. The
initial values for the system settings are as follows.
- Communications speed: 9600 bps
- Parity: Even
- Xon/Xoff control: Not executed
- Communication method: Full duplex
- Stop bits: 2 stop bits
- Data length: 7 bits
Set the unit number to 0 through F so
that it will not overlap with the numbers
used in other units.
Section 4-1