User's Guide

8400B Plus Data Module User’s Guide 555-020-709
Issue 2
November 1996
Installation
2-20
LED Indications
Idle Off On This is the unit’s normal mode if no
active data call exists.
The transmission of a character on the
Send Data lead will cause the red LED
to flash OFF for 100 ms.
The transmission of a character on the
Receive Data lead will cause the green
LED to flash ON for 100 ms.
The transmission of a continuous
stream of characters, on the Send Data
or Receive Data leads, will cause its
LED to flash OFF and ON at 100 ms
intervals.
Incoming Call Flash* On This indicates an incoming call.
Active Data Call On On This indicates an active data call.
The transmission of a character on the
Send Data lead will cause the red LED
to flash OFF for 100 ms.
The transmission of a character on the
Receive Data lead will cause the green
LED to flash OFF for 100 ms.
The transmission of a continuous
stream of characters, on the Send Data
or Receive Data leads, will cause its
LED to flash OFF and ON at 100 ms
intervals.
*A Flash is a repeating pattern of 500 ms ON and 500 ms OFF.
†A Wink is a repeating pattern of 750 ms ON and 250 ms OFF.
‡An
Inverted Wink is a repeating pattern of 250 ms ON and 750 ms OFF.
Table 2-2. LED Indication Summary
Status of Unit
Green
LED
Red
LED Description
020709_2.book Page 20 Friday, April 23, 1999 5:39 AM