26
SYNC SHM-NPR MP
4.2 Connection to the RS-232 Interface
Once you have connected the twisted-pair wires
correctly, simply plug the Sync SHM-NPR directly into
the DB25 port of the RS-232 device. After doing so,
remember to insert and tighten the two captive
connector screws.
4.2.1 C
ONNECTION TO A
DTE D
EVICE
The Sync SHM-NPR is wired as a DCE, and therefore
wants to plug into a DTE such as a terminal, PC, or host.
Because the Sync SHM-NPR is interface powered, a
direct connection to the RS-232 DTE port is preferred.
If you must use a cable to connect the Sync SHM-NPR to
the DTE port, make sure it is a straight-through cable of
the shortest possible length—we recommend 6 feet
(1.8 m) or less.
4.2.2 C
ONNECTION TO A
DCE D
EVICE
Since the Sync SHM-NPR is wired as a DCE, you cannot
connect it directly to another DCE such as a modem,
multiplexor, or printer. If you need to connect the Sync
SHM-NPR to another DCE device, you must use a null-
modem cable wired according to Figure 4-11. We
recommend that the cable be as short as possible,
preferably 6 feet (1.8 m) or less.
