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Chapter 3 P-Series EVFU
P-Series EVFU
The EVFU may be selected in P-Series protocol. The EVFU provides 14 or 16
channels to identify up to 192 lines depending on the paper instruction. The
programming sequence is 1) start load code; 2) line identification code; and 3)
end load code.
Start Load Code - 1E or 6E Hex
The start load code clears and initializes the EVFU memory for the memory
load program. The start load code is 1E hex when the PI line is disabled (low)
or 6E hex when the PI line is enabled (high).
Channel Assignment
The EVFU memory has the capacity for 192-line forms. The first line
identification code (channel code) in the memory load program defines the
first line on the form; the second line identification code defines the second
line on the form, etc. Each line must have a line identification code. Filler
channel codes are used for lines that will not be accessed by the print
program. Any channel code can be used as a filler except channel code 1,
which is reserved for the top-of-form, and channel code 12, which is reserved
as the vertical tab channel. The same filler channel code can be repeated as
necessary for any number of lines.
Channel 1. The top-of-form code, reserved as the first line on the form or the
first line printed (top-of-form position). The operating program sends the
channel 1 code to advance to the top of the next form. After the memory is
loaded, a Form Feed code (FF, 0C hex) will move the paper to the next
channel 1 (top-of-form).
Channels 2 through 11, 13 and 14. Used as general channel codes (line
identification codes) or filler channels. Each line on the form must be identified
by a channel code. When the operating program sends the channel code, the
paper advances to the line identified by the channel code. Lines not used by
the operating program must be identified by filler channels (unused channel
codes).
Channel 12. Reserved as the Vertical Tab channel. The Vertical Tab code
(VT, 0B hex) prints any data in the print buffer and rapidly slews the paper to
the next line identified by the channel 12 code. If channel 12 is not loaded in
the EVFU memory, a single line feed will be executed when a VT code is sent.
Channel 15 and 16. Used as general channel codes or filler channels only
when the VFU is accessed by the PI line. In an EVFU form that does not use
the PI line, the codes for Channels 15 and 16 function as the Start Load and
End Load codes.
End Load - 1F or 6F Hex
The end load code terminates the memory load program. The end load code
is 1F hex when the PI line is disabled (low) or 6F hex when the PI line is high.