53
Connecting to the RS-232C Port at the Host Section 4-1
*1
Set the host link communications speed at 9600 bps or 19200 bps with the
memory switch at the NT31/NT31C. For details, refer to 6-7-2 Setting the
Host Link Method (page 161).
*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-@).
Setting the Front Switches
Connecting to a CPU Unit CV-series and CVM1/CV-series (-EV
@) CPU Units
• CV500-CPU01-EV1/CV1000-CPU01-EV1/CV2000-CPU01-EV1
• CVM1-CPU01-EV2/CVM1-CPU11-EV2/CVM1-CPU21-EV2
PLC Setup
When connecting to a CVM1/CV-series CPU Unit, set the following communi-
cations conditions for the PLC Setup.
Set the host link communications speed at 9600 bps or 19200 bps with the
memory switch at the NT31/NT31C. For details, refer to 6-7-2 Setting the Host
RS-232C
Communications port 1
(RS-232C)
Communications port 2
(RS-232C/RS-422A)
I/O port selector switch
RS-422A
• Unit # (SW3, SW4)
• Communications condition setting (DIP SW1)
- Communications speed: 9600 bps
- Parity: Even
- Xon/Xoff control: Not executed
- Communications method: Full duplex
- Stop bits: 2 stop bits
- Data length: 7 bits
• I/O port selection (selector switch)
Set this to RS-232C.
• CTS selection (DIP SW2 and SW3)
When using communications port 2, set
these switches to 0.
Set SW2 or SW3 to ON. (Set this always to 0 V.)
To use communications port 1, set SW2. To use
communications port 2, set SW3.
Set this switch to OFF.
Communication is executed in accordance with the
CPU bus unit system settings made at the PLC. The
initial values for the system settings are as follows.
Item Setting at Host
Communications speed
Set the same speed as set at the NT31/NT31C
(*1)
Stop bit 2 stop bits
Parity Even
Data length ASCII 7 bits
Unit # 00
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