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4-3
Section
CPM2A/CPM2C Communications Functions
245
This section describes RS-232C connections.
One-to-one Connections
The RS-232C port on the Host Link computer and the RS-232C port on the
CPM2A/CPM2C or CPM1-CIF01 RS-232C Adapter are connected as shown in
the following diagram when there is no CTS control on the RS-232C port. With
the CPM2C, the CPM2C-CN111 and CS1W-CN118 connecting cables can be
used in place of the RS-232C Adapter.
IBM PC/AT or compatible
RS-232C port
Signal
Pin No.
Signal
Pin No.
Hood
One-to-N Connections
Set the DIP switch on the NT-AL001 RS-232C/RS-422 Conversion Adapter.
Normally ON
ON when the Unit is at the end of the transmission path. OFF in all other cases.
Used as a 4-conductor method. (Both switches set to OFF)
According to RS-232C CTS control (5: OFF, 6: ON)
The RS-232C port with the NT-AL001 RS-232C/RS-422 Conversion Adapter
and the RS-232C port of the CPM2A/CPM2C or CPM1-CIF01 RS-232C Adapter
are connected as shown in the following diagram when there is no CTS control
on the RS-232C port. A power supply of 5 VDC is supplied to the
RS-232C/RS-422 Conversion Adapter. With the CPM2C, the CPM2C-CN111
and CS1W-CN118 connecting cables can be used in place of the RS-232C
Adapter.
NT-AL001 RS-232C/RS-422
Conversion Adapter
Signal
Pin No.
RS-232C port
Signal
Pin No.
Hood
Note
Do not connect external devices other than the NT-AL001 Conversion Adapter
to the 5 VDC power supply of pin number 6 on the CPM2A/CPM2C’s RS-232C
port. Doing so may result in damage to the CPM2A/CPM2C or to the external
device.
Connecting the Cables