VXI EX7000 user manual General Purpose I/O, Characteristic Value

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When enabled as an output, each channel also has the ability to generate a 1 µs pulse upon command. An example application of this pulse is to use the EX7000 to externally trigger another piece of test equipment. The specific operation of the pulse depends on the static level programmed for that channel. When a channel is programmed with a static level of high, the pulse will be low-going. When a channel is programmed with a static level of low, the pulse will be high-going. Each pulse generation requires a separate command.

The electrical specifications for the digital I/O port are provided in Table 3-1. Particular note should be given to the VINPUT specification of -0.5 V to 5.5 V. Exceeding that value with an external voltage source, even through a resistance, could permanently damage the EX7000.

Characteristic	Value
VINPUT	-0.5 V to 5.5 V
VIH	2 V min
VIL	0.8 V max
VOH (IOH = -32 mA)	2 V min
VOL (IOL = 64 mA)	0.55 V max

TABLE 3-1: DIGITAL I/O PORT ELECTRICAL SPECIFICATIONS

General Purpose I/O

The EX72SF features an additional 32-bit general purpose TTL I/O port. This is in additional to the internal 72-channel relay drivers and the 8-bit digital I/O described above. The following are the pin assignments for the rear-mounted 37-pin D-sub connector:

Pin	Signal	Pin
1	GND	20
2	PIO-PORT1	21
3	PIO-PORT3	22
4	PIO-PORT5	23
5	PIO-PORT7	24
6	PIO-PORT9	25
7	PIO-PORT11	26
8	PIO-PORT13	27
9	PIO-PORT15	28
10	+5 V	29
11	PIO-PORT16	30
12	PIO-PORT18	31
13	PIO-PORT20	32
14	PIO-PORT22	33
15	PIO-PORT24	34
16	PIO-PORT26	35
17	PIO-PORT28	36
18	PIO-PORT30	37
19	GND

Signal PIO-PORT0PIO-PORT2PIO-PORT4PIO-PORT6PIO-PORT8PIO-PORT10PIO-PORT12PIO-PORT14

GND

GND PIO-PORT17 PIO-PORT19 PIO-PORT21 PIO-PORT23 PIO-PORT25 PIO-PORT27 PIO-PORT29 PIO-PORT31

A current limited supply of +5 V is provided on pin 10. An internal, resettable fuse is provided to protect 200 mA against excessive current flow and short circuits.

EX7000 Series Basic Operation 21