5-1SectionConnecting to the Host’s RS-422A/485 Port
71
*1 Set the Host Link baud rate at 9,600 bps or 19,200 bps with the Comm. Speed
memory switch at the NT21. For details, refer to Setting the Host Link Method
(page 125).
*2 The 1-to-N setting enables BCC (Block Check Character). It is not actually
possible to connect more than one NT21 in a single Host Link.
The setting methods for each model of Unit are described below.
Connecting to a C-series Host Link Unit
C200H/C200HS/C200HE(-Z)E/C200HG(-Z)E/C200HX(-Z)E
Rack-mounting model: 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.
@
Command level, parity
, and transfer code (SW4)
Set this switch to 2.
@
Baud rate (SW3)
Set this switch to 5 to select 9,600 bps.
Set this switch to 6 to select 19,200 bps.
SW3
SW2
SW4
Setting the Rear Switches
@
T
erminator 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
Connecting to a CVM1/CV-series Host Link Unit
CVM1/CV-series Rack-mounting model: CV500-LK201
A
CVM1/CV
-series Host Link Unit (CV500-LK201) has two connectors (commu
-
nication
ports
1 and 2). T
o use the RS-422A type Host Link method, set commu
-
nication port 2 to RS-422A.
Communication
port 2 is a 9-pin connector that allows selection of the RS-232C
or
RS-422A method.
When this port is used with the RS-422A method, the I/O
port selector switch on the front of the Unit must be set to RS-422A (the lower
position).
CPU Bus Unit Settings
When
connecting to a CVM1/CV
-series Host Link Unit, set the following
commu
-
nication conditions for the CPU Bus Unit settings.
Item Setting at Host
Baud rate Set the same speed as for the NT21.
(*1)
Transfer code ASCII, 7 data bits, 2 stop bits
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