GE GEK-36150 terminet 300 Operator's Manual page 55

GEK-36150
Operating Characteristics
Should an operator "get ahead" of the recording mechanism by typing while a space is being written, an alarm will
be generated. This is very unlikely for keyboard data but could occur for an answerback sequence. This alarm will
light the alarm lamp, turn off the motor, transmit a break, and sound the alarm. This action is for local data only.
Received data cannot cause this alarm, facilitating the use of Fill Characters for timing. If adequate fill characters are
not included, received data may be lost (not copied on tape).
In Transparency
Data received in Transparency is recorded exactly as received. Therefore, no automatic spaces are generated and each
delay character must be followed by 3 Fill Characters
(5
Fills after VT or FF). Delay time may not be substituted
for these Fill Characters when recording incrementally.
Non-Incremental Rate
Magnetic Tape recording at 1200 baud is done differently with the TermiNet 1200 than the TermiNet 300. Unlike
the TermiNet 300, operation with the TermiNet 1200 at 1200 baud is not character dependent. Whenever the
terminal is in the 1200 baud rate position, and the A3 TCA in RECORD Mode, the TCA will move tape at the
proper rate for 1200 baud recording, regardless of the condition of the data stream except during VT or FF motion.
Data transmitted to the TermiNet 1200 should contain all fills required for printing, with the added condition that
every LF code should be followed by 3 fills or 24 msec. of time. If the Printer is receiving the transmission in
Transparency or Standby, then 3 Fills or 24 msec. of time should follow each delay character except VT or FF
codes which must be followed by 5 Fills or 41 msec. Recording is not dependent on the state of the Data Set
Interface signals.
READING (Incremental or Non-Incremental)
The A3 Model TCA does not delay after every LF code when reading. An internal timer will cause delays to
guarantee the minimum time required for the TermiNet 1200 operation. LF, BS, VT, and FF characters will be
separated by 300 msec. if they appear closer than this in the data stream. Timing for VT and FF will be as required
for proper operation (closed Loop TCA to TermiNet). The TCA will always delay a full 300 msec. for MOTOR ON
and MOTOR OFF (ESC Hand ESC J). A strap is included to vary the timer. With the jumper out, the timer will run
at 430 msec., long enough for all codes. With the jumper in, the timer will run 300 msec., which is adequate for all
codes except MOTOR ON. Fill Characters (additional 16 Fills) must be recorded after the MOTOR ON, if the 300
msec. timing is used. If the Printer is in Transparency, no delays will occur.
When the Printer is on ON LINE or STANDBY, the Data set Interface Signal Clear to Send (CB) must be present to
read tape. If a DC3 code or an Interrupt is received, the TCA will stop reading after the next character is read.
TIME DELAY AND Fl LL CHARACTER CHART
The chart on the following page summarizes the time delays and fill characters required when using the A3 TCA
with the TermiNet 1200 Printer.
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