CCJ4HUNICATI0NS SECTION 6.7
6,7,6, 1.1 Transmit Buffer
VER.V09F
On transmit while one buffer is being filled from the user
program the other is being sent. When the new buffer is full
the buffers effectively swap over and the cycle is continued:
Fig 6. 11 TRANSMIT llJFFER
Characters __.
Basic
Prog
Sending
Characters
Buffer A
Buffer B
Transmitting
Software
Characters___.
Buffer
A is filling whilst buffer B transmits.
Basic
Prog
Sending
Characters
Buffer
A
Buffer B
Characters_....
Characters___.
Transmit ting
Software
Buffer Bis filling whilst Buffer A transmits.
Communication
Channel
Communication
Channel
The maximum buffer length, including control characters, that
can be received is
512 characters. However, some systems are
only configured for
256 characters. For this reason HUl'll'ER will
only default to transmitting 200 characters for ease of inter-
facing.
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