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Connecting to the Host’s RS-422A/485 Port
Section 5-2
Connecting to a CVM1/CV series host link unit
CVM1/CV series rack-mounting type: CV500-LK201
A CVM1/CV series host link unit (CV500-LK201) has two connectors (commu-
nication ports 1 and 2). To use the RS-422A type host link method, set commu-
nication port 2 to “RS-422A”.
Communication port 2 is a 9-pin connector which allows selection of the
RS-232C or RS-422A method. When this port is used with the RS-422A meth-
od, 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
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
*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.
Set the CPU bus unit settings directly from a peripheral tool (e.g. SYSMAC sup-
port software).
For details on the CPU bus unit settings, refer to the SYSMAC CVM1/CV series
Host Link Unit User’s Manual (W205).
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