HP 8711C, User Manual, Page: 312 / 530

Automating Measurements
Controlling Peripherals
15
9
Register
1
2
3
Table 7-4. Writeable Ports
Description
Outputs B-bit data to the thru lines of the Centronics port. Cent-DO is the
least bit, is the most significant bit. Checks Centronics status lines for:
of Paper
Printer Not on Line
BUSY
ACKNOWLEDGE
Sets/clears the user bit according to the least significant bit of A. A least significant bit
equal to 1 sets the user bit high. A least significant bit of clears the user bit.
Sets/clears the limit pass/fail bit according to the least bit of A. A least
bit equal to 1 sets the pass/fail bit high. A least significant bit of 0 clears the bit.
Outputs I-bit data to the Cent-DO thru lines of the Centronics port. Cent-DO is the
least significant bit,
is the most significant bit. Sets the Printer-select signal high
(de-select]. Does not check Centronics status lines.
Outputs a byte to the serial port. The byte is output serially according to the configuration
for the serial 0
Table Readable Ports
Number Register Description
15
I
Reads the serial port.
Reads the g-bit data port Cent-DO thru
Reads the user bit.
Reads the limit test pass/fail bit.
15
I
IO
I
Reads the g-bit status port.
DO-Cent-acknowledge
Dl-Cent-busy
7-55
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