Auxiliary Inputs - Ametek 7280 Instruction Manual

Chapter 6, COMPUTER OPERATION
BYTE [n]
READBYTE

6.4.08 Auxiliary Inputs

ADC[.] n
TADC [n]
6-24
Digital port output control
The value of n, in the range 0 to 255, determines the bits to be output on those lines
of the rear panel digital port that are configured as outputs. Hence, for example, if
PORTDIR = 8 and BYTE = 0, all outputs are low, and when BYTE = 255, all are
high.
Read digital port input
The response to the READBYTE command is an integer between 0 and 255
representing the binary value of all eight lines of the rear panel digital port. Hence,
for example, if PORTDIR = 0 and the response to READBYTE is 255, then all lines
are high, and if the response to READBYTE is 0, then all lines are low. Note that
because the command does not differentiate between whether a line is configured as
an input or output, it can be used as a single command to determine the present status
of all eight lines, both inputs and outputs, of the port.
Read auxiliary analog-to-digital inputs
Reads the voltage appearing at the ADC1 (n = 1), ADC2 (n = 2), ADC3 (n = 3) or
ADC4 (n = 3) inputs on the rear panel.
The response is an integer in the range -12000 to +12000, corresponding to voltages
from -12.000 V to +12.000 V, and in floating point mode it is in volts.
Auxiliary ADC trigger mode control
The value of n sets the trigger mode of two of the auxiliary ADC inputs according to
the following table:
n Trigger mode
0 Asynchronous (5 ms intervals)
1 External ADC1 and ADC 2 (rear panel TRIG input)
2 Burst mode, 25 µs/point, triggered by command (ADC1 only)
3 Burst mode, 56 µs/point, triggered by command (ADC1 and ADC2)
4 Burst mode, variable rate, triggered by command (ADC1 only)
5 Burst mode, variable rate, triggered by command (ADC1 and ADC2)
6 Burst mode, 25 µs/point, External trigger with < 1.25 ms trigger indeterminacy
(rear panel TRIG input) (ADC1 only)
7 Burst mode, 56 µs/point, External trigger < 1.25 ms trigger indeterminacy (rear
panel TRIG input) (ADC1 and ADC2)
8 Burst mode, variable rate, External trigger < 1.25 ms trigger indeterminacy (rear
panel TRIG input) (ADC1 only)
9 Burst mode, variable rate, External trigger < 1.25 ms trigger indeterminacy (rear
panel TRIG input) (ADC1 and ADC2)
10 Burst mode, 25 µs/point, External trigger with < 25 µs trigger indeterminacy
(rear panel TRIG input) (ADC1 only)
11 Burst mode, 56 µs/point, External trigger with < 25 µs trigger indeterminacy(rear
panel TRIG input) (ADC1 and ADC2)
12 Burst mode, variable rate, External trigger with < 25 µs trigger
indeterminacy(rear panel TRIG input) (ADC1 only)
13 Burst mode, variable rate, External trigger with < 25 µs trigger
indeterminacy(rear panel TRIG input) (ADC1 and ADC2)