User`s manual

7–44 Digital Emulation
Load Vertical Format Unit (VFU)
ASCII Code ESC [ < 1 h
Hex Code 1B 5B 3C 31 68
Dec Code 27 91 60 49 104
Purpose Downloads the VFU from the host to the printer.
Discussion All data following the begin load sequence is placed in VFU memory
except ASCII control codes. Any command entered during load VFU is
ignored except the End Load sequence. During VFU load, a unique code
is displayed on the control panel.
All data must be in the VFU load format. If an error occurs during the load,
the load is cancelled. If a load overruns the maximum forms length, the load
is cancelled and any remaining VFU data is printed. Cancelled loads default
to the current form length setting (as set from the control panel or with the
DECSLPP escape sequence).
VFU load format consists of 2 bytes (one byte pair) for each line on the page.
The structure of each byte follows:
Table 7–10. Byte 1 Structure (First Character of Pair)
Bits: 7 6 5 4 3 2 1 0
Values: x 1 C6 C5 C4 C3 C2 C1
The following define the values in Table 7–10:
Bit 7 is not used.
Bit 6 is always 1.
Bits 5 – 0 represent channels with binary 1s and 0s.
Bit 1 has a channel present.
Bit 0 has no channel.