User's Manual

A-3
RS-422 Termination Jumpers
Refer to the circuit board diagram on page A-1 for details.
The Base and Relay can be jumpered to be 422 terminated or not ter-
minated. By default, all Base stations and Relay are shipped as terminated.
Use the following guidelines to change the termination for your system:
• If the Base has multiple strings of relays radiating from it, the Base
would not be terminated.
• If the Base is first in a string, (not in the middle or end of a string), set
the 422 jumpers to Base w/RS-422 termination.
• The last Relay in each string should have its jumpers set as a Relay
w/RS-422 termination.
Frequency Changes
To determine the current frequency of a Base Station or Relay, power up
the Base or Relay and watch the LED light on the front of the unit. On
power UP, a Base or Relay LED will blink "Frequency +3" times. For
example, a unit that blinks 5 times on power up is operating on frequency
2. Frequency 0 blinks 3 times, frequency 5 blinks 8 times.
Changing the frequency on a Base or Relay
The Base Station and Relay must have their frequencies set to the same
frequency as the R/F Terminals in their network. The frequency is set on a
Base or Relay by turning a rotary switch to the setting 0-F (16 different
frequencies to choose from). Jumper JP103 should be set to Normal when
making this change. Use a very small flat head screwdriver to turn the
switch to the desired number. See the circuit board diagram on page A-1 for
location of the rotary switch
Setting the Relay ID
Each Relay must also have a unique ID, which is also set by turning the
rotary switch, but is a little more complicated than setting the frequency:
• Move Jumper JP103 to P (for Programming)
• Move the Rotary Switch (SW1) to a position (0-F) to correspond to
the ID to which you wish to set the Relay Station.
• Now cycle power on the Relay Station.
• Set JP103 back to N (for normal) and restore the Rotary Switch to
the frequency setting on which you intend operate the Base
Station and Terminals in the network.