Anadex DP-9000 Operator's Manual page 55

STX/ETX/LRCC
(Continued)
STX/ETX and
STX/ETX/LRCC
- made. The data source is expected to
compute its own LRC and transmit an LRC
Character (LRCC) following the ETX. The
printer will then compare the LRCC
received against its own LRCC. If no
communications errors occurred, and the
LRCC's match, an ACK is transmitted by
the printer. If errors are detected,
the transmitted code is NAK. Subse-
quent actions are the same for STX/ETX.
The LRCC character calculation is made
by nulling a register and then XORing
each character transmitted exclusive of
the STX but including the ETX. The
result is then transmitted as the char-
acter immediately following the ETX.
- When errors are detected and the data
block is cancelled, certain ESC
sequences are not cancelled.
These are:
3-17
ESC B
ESC
C
ESC 7
ESC VN
Set Horizontal Tabs
Clear Horizontal Tabs
Set Form Width
Set or Reset Auto-LF
Mode