Installation
12
User’s Manual - DSP19.2 Fast Poll Modem
Configuring the Modem
You configure the modem using the two sets of DIP switches and two sets of configuration
jumpers on the printed circuit board of the modem labeled
S1
and
S2, JP1
and
JP3
.
Configuration DIP switches
S1
and
S2
for the stand-alone and rack-mount modems are
identical. Their descriptions in this user’s manual apply to both modem versions.
Configuration jumper
JP1
for the rack-mount modem card is used to select receiver
termination impedance.
It is important to follow the steps described below, in the order shown, to ensure that you
configure your modem properly using the modem DIP switches:
1. Use DIP switch 1 (
S1
) to configure the modem for your host DTE interface and
network topology. Using
S1
, you select the modem’s operating speed to match
you host computer or RTU devices, and other DTE specific operating
parameters.
2. Use DIP switch 2 (
S2
) to select the modem’s transmitter output level and receiver
dynamic range specific leased line conditions. The
S2
settings apply for both
high-speed fast-poll (QAM) and low-speed (FSK) modes.
3. After you change the DIP switch settings, recycle power to the modem to have
the settings take effect.
NOTE:
The DIP switch settings will not take effect until you recycle power to the
modem.
To access the configuration DIP switches and jumpers on the stand-alone modem:
1. Ground yourself to discharge any ESD, which might cause damage to the
sensitive devices on the modem board.
2. Use a small Philips screw driver to remove the rear panel and carefully slide the
modem board out of the enclosure. The location of the DIP switches and jumpers
for the stand-alone modem are shown in Figure 2-4. For DIP switches and
jumpers on the rack-mount plug-in module, see Figure 2-5.
3. Carefully return the modem board into the enclosure. Then replace the rear panel
after the configuration is completed.
