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5-2SectionConnecting to the Host’s RS-422A/485 Port
103
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 158).
*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.
Connecting to a C Series Host Link Unit
C200H/C200HS/C200HE(-Z)E/C200HG(-Z)E/C200HX(-Z)E
Backplane mounting type: C200H-LK201-V1
Setting the Front Switches
Set each switch with a flat blade screwdriver so that the values or symbols in the
setting value window agree with the following:
LK201
RUN
RCV
XMT
ERROR
SW1
0
0
5
2
@ Unit # (SW1, SW2)
Set these switches to 0.
@ Instruction level, parity, and transfer code (SW4)
Set this switch to 2.
@ Communications speed (SW3)
Set this switch to 5 to select 9600 bps.
Set this switch to 6 to select 19200 bps.
SW3
SW2
SW4
Setting the Rear Switches
@ Terminator setting (selector switch)
Set this switch to ON.
@ 1-to-1/1-to-N protocol selection (selector switch)
Set this switch to 1-to-N (OFF).
Terminator
OFF
1-to-1 (ON)
1-to-N (OFF)
ON