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INTRODUCTION
OVERVIEW
The Zetron Model 25 Programmable Encoder is a console or rack mounted selective
signaling encoder, specifically designed for use in public service and public utility dispatch
centers where operators need the ability to send calls quickly and efficiently.
The Model 25 provides several innovative features. One of these features is the ability to
send multiple calls over automatically selected channels by the press of a single Instant Call
pushbutton. Multiple Instant Calls may be queued for transmission to dispatch groups of
personnel quickly. Each Instant Call pushbutton shows its call progress via integral LEDs.
Since January of 2005, all Model 25 Encoders have shipped with paging formats and the
Instant Call option enabled. Model 25 Encoder purchased prior to the beginning of 2005 may
require an upgrade kit in order to enable all options. For encoders equipped with a keypad,
display, and only 29 Instant Call buttons, programming may be accomplished from the
keypad or from a PC connected to the computer port. For units equipped with 59 Instant Call
buttons, but no keypad or display, programming can be done only from a PC connected to the
computer port
Another feature is the RS-232 serial computer port. The port has several applications. One
application is the connection of a logging printer to log all activity of the encoder. With the
optional Real Time Clock, the time is also printed. Another application is the connection of a
PC to control the encoder remotely. Almost anything that can be done from the keypad may
also be accomplished via remote control.
As with all Zetron encoders, the advanced and reliable microprocessor design allows
upgrading of the Model 25 to virtually all signaling formats used in the communications
industry.
FRONT PANEL DESCRIPTION
The Model 25 Programmable Encoder may be ordered in one of two configurations. One of
these configurations (901-9019) is equipped with a keypad and display, allowing for manual
and backup operation. The keypad-equipped configuration also contains 29 Instant Call keys.
The other configuration (901-9022) contains 59 Instant Call keys but no keypad or display.
The front panel of the encoder without keypad looks identical to that of the Auxiliary Instant
Call panel (901-9020).
In the following discussions on operation, references to “status display”, “encoder display”,
“display”, “keyboard”, or “keypad” only pertain to the encoder configuration that is equipped
with these items (901-9019). In addition, references to “time” or “time clock” only pertain to
encoders equipped with that option.
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