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o Type to stop sending when the transmit buffer is empty.<br />
breaks the link and returns your <strong>PK</strong>-<strong>232</strong> to Command Mode.<br />
7.3.6 LED Status and Mode Indicators<br />
All the LEDs on the front of the <strong>PK</strong>-<strong>232</strong> are there to help give you the<br />
units status at a glance. This is especially true in AMTOR operation.<br />
The following describe typical LED status indications you will see.<br />
Type "ARQ (SELCALL of distant station)." The LEDs change to:<br />
STATUS:<br />
MODE:<br />
SEND lit, PHASE lit<br />
ARQ lit<br />
These LEDs show that your transmitter is in the SEND condition, in the<br />
"phasing" part of an ARQ selective call. Your transmitter will key on<br />
and off sending the distant station's SELCALL. As soon as your <strong>PK</strong>-<strong>232</strong><br />
is synchronized with the distant station, the LEDs change to:<br />
STATUS:<br />
MODE:<br />
SEND lit, TFC and IDLE lit alternately by data flow<br />
ARQ lit<br />
Verify the link by typing a few s; watch the display. Your<br />
traffic will now begin to flow as you type characters. If EAS is set<br />
ON, your typed characters are displayed as they are acknowledged by<br />
the distant station. The IDLE and TFC LEDs change back and forth<br />
whenever your typing pauses.<br />
If errors occur on the link and the distant station sends RQ (Request<br />
for Repeat), the LEDs show:<br />
STATUS<br />
MODE<br />
SEND lit, ERROR and/or RQ lit<br />
ARQ lit<br />
ERROR lit:<br />
RQ lit:<br />
Your <strong>PK</strong>-<strong>232</strong> has detected errors in the signals<br />
received from the distant station<br />
Your <strong>PK</strong>-<strong>232</strong> has received a "request for repeat"<br />
code from the distant station<br />
If the link fails and you lose synchronization with the distant<br />
station your <strong>PK</strong>-<strong>232</strong> automatically tries to re-establish<br />
synchronization with the distant station. The LEDs change to show:<br />
STATUS:<br />
MODE:<br />
SEND lit, PHASE lit, ERROR and RQ alternately lit<br />
ARQ lit<br />
After typing FEC, your <strong>PK</strong>-<strong>232</strong> displays system status on its LEDs:<br />
STATUS:<br />
MODE:<br />
SEND lit, IDLE lit, TFC lit only briefly<br />
FEC lit<br />
As you send your traffic the TFC LED will light. Whenever you stop<br />
typing, the TFC LED is extinguished and the IDLE LED is lit.<br />
STATUS:<br />
MODE:<br />
SEND lit, TFC and IDLE lit alternately by data flow<br />
FEC lit<br />
4/91 7-6<br />
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