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Connecting to the Host’s RS-422A/485 Port
Section 5-2
The host link method cannot be used when an NT31/NT31C is connected using
RS-485. To use the host link method, connect by RS-422A.
Settings at the host
When using the RS-422A type host link method, the settings shown below must
be made at the host (depending on the unit, some of these settings may not be
necessary, or settings not shown here may be necessary).
Item Setting at Host
I/O port RS-422A
Communications speed Set the same speed as for the NT31/NT31C.
(*1)
Transfer code ASCII, 7 data bits, 2 stop bits
Parity Even
1-to-1/1-to-N 1-to-N
(*2)
Instruction level Level 1, 2, 3
Unit # 00
*1 Set the host link communications speed at 9600 bps or 19200 bps with the
“Comm. Speed” memory switch at the NT31/NT31C. For details, refer to “Setting
the Host Link Method” (page 175).
*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.
The setting methods for each type of unit are described in the following.
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