CCJ1MUNICATIONS
SECTION 6.7
2780
mode:
Fixed length records are terminated by any of the following:
US,CRC
ETB,CRC
ETX ,CRC
used for a partly filled buffer
used for a full buffer
used for the last buffer to be sent
Variable length records are terminated by any of the following:
6,7,6.5.6
6,7,6,5,7
VER.V09F
EM,US,CRC
EM,ETB,CRC
EM,ETX,CRC
3780
mode:
used for a partly filled buffer
used for a full buffer
used for the last buffer to be sent
All records are terminated with:
IRS
On receive, record terminators (CR) are always returned for:
US CRC
IRS
irrespective of the setting of the mode flag,
STX flag - (Memory location F859 or 63577)
This flag is a single byte and controls the use of intermediate
STXs, If the flag is set to non-zero, at the start of every
intermediate record an STX is inserted, If the flag is zero,
then STXs are not inserted except at the start of the first
record in a block, Intermediate STXs are ignored on reception,
The default of this flag is zero,
This feature is normally only used in 2780 installations,
Retry flag - (Memory location F85A or 63578)
This single byte flag controls how the protocol handles errors.
If the flag is set to zero (its default state), then when an
error in communication causes the HUNTER to re-try sending the
last block, the HUNTER will re-try 10 times before giving a
communication error, If, however, the flag is set to non-zero,
the HUNTER will re-try indefinately until either it succeeds or
the operator switches the HUNTER off,
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