Option Selection; General; Strap Option Selection; Removing Cover - Black Box 325 User Manual

MODEM 325 AND MODEM 325 CARD

4.1 General

This chapter contains the options available by pushbutton in response to the LCD.
There are four factory option sets to choose from. The modem is shipped configured to factory option
set #1 (see Appendix D). Because of the number of possible applications, most modems require some
option changes to fit into the network.
A user programmed option set is available for storing a custom configuration.

4.2 Strap Option Selection

Modem configuration is determined by front panel controls, AT commands,and hardware option straps
located on the pc board. Remove the modem cover for access to the option straps.
R C
EMOVING OVER
Disconnect AC power before removing the cover. Although dangerous voltage levels are
not exposed, disconnecting power eliminates the hazard of electrical shock.
Place the unit on its side on a flat surface. Insert a medium-size flat screwdriver blade in one of the
bottom rear latch slots. DO NOT PUSH the screwdriver but lightly pry the handle away from the unit as
illustrated in
Figure 4-1
pushing the cover from the chassis with your fingers on the rear edges of the unit. Repeat this procedure
with the remaining three latch slots.
To replace the cover, align the lock clips, rear guide grooves, and front lock tabs. Press the cover in
place until the lock clips engage the lock prongs.
shows typical strap configurations and
Figure 4-2
2 8

4. Option Selection

Normally, PC board straps will not have to be changed.
. This will disengage the lock prong from the lock clip. Assist removal by
NOTE
NOTE
WARNING
shows strap locations.
Figure 4-3