Introduction
2 025-9567E
There are two basic modes of operation for the Model 25 encoder; remote control and instant
call modes. In remote control mode, input is accepted in ASCII from the RS-232 compatible
Computer Port, but the Instant Call panels are disabled. In instant call mode the Instant Call
panels are enabled but remote control is inhibited. Selection of the mode depends on the level
present on the “remote control” signal of the Computer Port connector. In either of the
modes, the keypad may either be enabled or disabled depending on the position of the keypad
jumper inside the enclosure. At all times, the status of the encoder is being displayed on the
front panel and if call logging is enabled outputted in ASCII via the Computer Port for
possible printing.
Figure 1. Model 25 Front Panel Controls
Callout # Item Description
1 Display Window (4 digits)
2 Keypad
3 Extended Keys
4 Send Buttons
5 Serial Port
6 Instant Call Buttons
Display
The Model 25 is supplied with a 4-digit, 7-segment, LED display. It is capable of displaying
alphanumeric characters. Figure 2 shows a few examples of the various characters and
prompts that can be displayed.
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