Specifications

Cascade Modem Manual
Copyright © 2007 Diamond Traffic Products, Inc
Page 7
2. Modem Functions
The following sections describe various modem functions and operations. NOTE: The letters DTE refer to the
connection from the modem to the traffic counter or other device connected to the modems RS232 Serial Port
(DB9). DTE stands for Data Terminal Equipment.
2.1. Jumper Settings
The modem has a block of 4 jumpers which allow customer specific configuration of several modem options. Refer
to the chart below for specific information.
Label
Factory
A Setting
B Setting
MOD
B
Keeps modem on all of the time.
This increases power draw to
about 40mA all of the time.
Shuts modem off after 5 minutes of no
TXD or Ring activity. Power draw drops
to about 0.1mA when modem is off.
TRA
B
RS232 output lines stay active all
of the time. This costs power
(about 0.7mA) but allows devices
who need these lines active to
operate.
Output lines are turned off when modem
is off. This saves a lot of power but will
prevent CTS and other output lines from
the modem from being active.
RNG
B
Connects Ring output on the DB9
to Power Input on the modem.
This is useful if you want to feed
power to the modem through pin 9
instead of using it as a Ring
indicator (which many systems
don't need).
Connects Ring output on the DB9 (Pin 9)
to Ring detect on the modem module.
SHD
B
Connects the Shield of the DB9 to
Power Input on the Modem.
Connects the Shield of the DB9 to
Ground on the modem.