Omron NT20, User Manual

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47
Connecting to the RS-232C Port at the Host Section 2-6
Connecting to a CVM1/CV-
series Host Link Unit CVM1/CV-series Rack-mounted Unit: CV500-LK201
A CVM1/CV-series Host Link Unit (CV500-LK201) has two connectors (com-
munications ports 1 and 2). Either of these ports can be used for connection
to an NT20 by the RS-232C method. However, since the connectors at these
ports are of different types, a cable that matches the connector must be pre-
pared.
• Communications Port 1
Communications port 1 is a 25-pin connector for RS-232C use only.
• Communications Port 2
Communications 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-232C
method, the I/O port selector switch on the front of the Unit must be set to
RS-232C (the upper position).
CPU Bus Unit Settings
When connecting to a CVM1/CV-series Host Link Unit, set the following com-
munications conditions for the CPU Bus Unit settings.
Note (1) Set the Host Link baud rate at 9,600 bps or 19,200 bps with the memory
switch at the NT20.
(2) The 1-to-N setting enables BCC (Block Check Character). It is not actu-
ally possible to connect more than one NT20 in a single Host Link.
Set the CPU Bus Unit settings directly from a Programming Device (e.g.,
SYSMAC Support Software).
For details on the CPU Bus Unit settings, refer to the SYSMAC CVM1/CV-
series Host Link Unit Operation Manual (W205-E1-
@
).
Item Setting at Host
Baud rate Set the same baud rate as set at the NT20 (See note 1.)
Transfer code ASCII, 7 data bits, 2 stop bits
Parity Even
1-to-1, 1-to-N
1-to-N (See note 2.)
Command level Level 1, 2, 3