19
LDM-144LR
RS-530/RS-449
The RS-530/RS-449 D-type connector has a standard 25-pin pinout. For a
description of the cabling connection between the RS-530 interface and the
RS-449/RS-442 (V.36) 37-pin, D-type connector (see
Appendix C
). The cable
is provided with the product.
3.4.4 S
TRAP
S
ELECTION
Although most of the modem configuration can be monitored and changed
via the front panel, there are straps that have to be set before you use the
modem. When the electrical installation has been completed and checked,
determine the required configuration of the LDM-144LR and position the
straps accordingly. The PCB strap locations of
Figure 3-5
correspond to the
numbers listed under “PCB Name” in
Table 3-1
.
WARNING
Disconnect the AC power cord before removing the unit’s cover.
Installation, operation, and maintenance should be performed by an
experienced technician.
3.4.5 I
NSTALLATION OF
I
NTERNAL
J
UMPERS AND
S
WITCHES
Before electrical installation, the LDM-144LR’s internal jumpers and switches
should be set according to the application. To access the internal jumpers
and switches:
1. Disconnect the AC power cord.
2. Lay the unit upside-down on a soft surface. (At the ends of both the left
and right sides, the plastic locking clips can be seen.)
3. With the tip of a flat screwdriver (or similar object), depress the plastic
housing-locking clips in turn, while gently prying the two halves apart.
4. Now separate the halves completely, taking care not to lose the two black
plastic side-strips.
