Agilent Technologies 4294A, Руководство по программированию

Страница: 127 / 518

Chapter 9 127
Communication with External Equipment (Using the I/O Ports)
Using the I/O Ports
1. Ch
apter
T
itle
2
. Cha
p
te
r T
itle
3
. Chap
te
r T
itle
9.
Communication w
ith
5. Chap
te
r T
itle
Exer
nal Equ
ipme
n
t
(U
s
ing
th
e I/
O Por
ts
)
Preset states at power-on
The 24-bit I/O port is set at power-on as follows (not affected at reset).
Logic Negative logic
Write strobe signal HIGH
SWEEP END signal HIGH
Port A Negative 0 Æ HIGH
Port B Negative 0 Æ HIGH
Port C Input
Port D Input
OUTPUT1 HIGH, HIGH at the fall of the INPUT1 input
OUTPUT2 HIGH, HIGH at the fall of the INPUT1 input
PASS/FAIL signal (Negative) Æ HIGH
Commands to control the 24-bit I/O port
To output data to each output port (A to H), use the following commands.
To use ports C, D, E, F, G and H as output ports, use the following commands to set ports C
and D as output ports in advance.
• “COUT” on page 283
• “DOUT” on page 307
GPIB command Instrument BASIC command Description
“OUTAIO” on page 369 “WRITEIO 16,0;” Outputs 8-bit width data to port A.
“OUTBIO” on page 369 “WRITEIO 16,1;” Outputs 8-bit width data to port B.
“OUTCIO” on page 370 “WRITEIO 16,2;” Outputs 4-bit width data to port C.
“OUTDIO” on page 370 “WRITEIO 16,3;” Outputs 4-bit width data to port D.
“OUTEIO” on page 371 “WRITEIO 16,4;” Outputs 8-bit width data to port E.
“OUTFIO” on page 371 “WRITEIO 16,5;” Outputs 16-bit width data to port F.
“OUTGIO” on page 372 “WRITEIO 16,6;” Outputs 20-bit width data to port G.
“OUTHIO” on page 372 “WRITEIO 16,7;” Outputs 24-bit width data to port H.