type at Host
Usable Connection Method
Host
Link
1:1 NT
Link
1:N NT
Link
Memory
link
Details
RS-422A
Direct 1:1 connection with RS-422A through a Link
Adapter
PT
Host
RS-422A
(max. 500 m)
NT-AL001* or
NS-AL002
Link Adapter
f f f f 85
RS-485
Direct 1:1 connection with RS-485 through a Link
Adapter
PT
Host
RS-485
(max. 500 m)
NT-AL001*
or
NS-AL002
Link Adapter
f 88
RS-422A
1:N connection with RS-422A through Link Adapters
PT
Host
RS-422A (total length 500 m)
NT-AL001* or
NS-AL002
Link Adapter
f 89
RS-485
1:N connection with RS-485 through Link Adapters
PT
Host
RS-485
(total length 500 m)
NT-AL001*
or
NS-AL002
Link Adapter
f 92
f: Connection possible : Connection not possible
Note *An
RS-232C Cable (not shown in the diagram) is required when connecting an
NT-AL001 Link Adapter to a PT.
• The
NT
-AL001 Link Adapter requires a +5-V
, 150 mA power supply at pin 6 of
the
RS-232C connector
. When the NT
-AL001 is being connected to the NT21,
a
5-V power supply is output from pin 6 of serial port A or B in the NT21.
Con
-
nect pin 6 of the Link Adapter’s RS-232C connector with pin 6 of the NT21’s
RS-232C connector.
When the NT-AL001 is being connected to a host and power is not supplied
from
the host’
s port, connect an external power supply to pins 6 and 9 of
the
Link
Adapter
’
s RS-232C
connector
. Connect the +5-V line to pin 6 and the SG
line to pin 9.
• Never connect or disconnect cables or Units to an NT-AL001 or NS-AL002
while
the power is ON. Be sure to turn OFF the power supply of
the NT21 or
host before connecting or disconnecting the cables.
• A
+5-V power supply is output from pin 6 of serial ports A
and B in the NT21. It is
possible to use the power from both ports simultaneously, but the maximum
capacity is 150 mA max. total. Do not exceed 150 mA total output.
• When using RS-422A or RS-485 communications, it is convenient to use an
NS-AL002 Link Adapter and make a direct connection to serial port B of the
NT21.
However
, there is no insulation between the NS-AL002’
s RS-232C port
and RS-422A/RS-485 port.
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