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30 N2 Dialer Module—N2 Dialer Module (NDM)
The NDM interfaces to a Hayes compatible modem through the RS-232 port. Plug the
supplied 24-inch, 8- to 25-pin, RS-232 cable into the NDM. The connector is keyed and
latching. The 25-pin DB-25 male connector interfaces directly to most modems. A
straight-through 25 to 9-pin adapter may be necessary for some modems with 9-pin RS-
232 ports. An extender cable (RS-232 25-pin male to 25-pin female straight-through)
may be used to remotely locate the modem up to 50 feet from the NDM.
TD
RD
RTS
CTS
DSR
SG
DCD
DTR
2
3
4
5
6
7
8
20
2
3
4
5
6
7
8
20
Out
In
Out
In
In
In
Out
Out
In
In
Out
Out
Out
In
NDM RS-232
Connector
Modem or Extender Cable
Connector (Female Connector)
232cabl
Figure 8: Connecting the NDM to the RS-232 Extender
Cable or Modem
Terminate the N2 Bus to the 3-pin plug-in terminal block. This allows easy disconnection
from the NDM without breaking the daisy chain connection to other devices on the bus.
Note:
Shielded N2 cable is not required.
REF
N2
N
2
-
+
termblk
Figure 9: 3-Pin Terminal Block
Wiring
Wiring the
Modem
N2 Bus Wire
Termination
Summary of Contents for N2
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