VTI Instruments Metek EX1202 User Manual page 64

VTI Instruments Corp.
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 EX1200 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 function call.
For expanded and more automated operation, each DIO channel can be independently linked to
any of the EX1200's backplane trigger lines, allowing any trigger condition (such as an over-limit,
or measurement complete event) that can be asserted by a plugin-module or the integrated DMM
on those backplane lines to be exported to any of the DIO channels.
The electrical specifications for the digital I/O port are provided in Table 3-. Particular note should
be given to the V
voltage source, even through a resistance, could permanently damage the EX1200.
Trigger Bus
The EX1200 provides an compatible trigger bus connector set on the rear panel of the instrument.
Both connectors have the same pin assignments and are wired in parallel. For more information on
the Trigger Bus and creating an appropriate cable, please visit
LXI Standard Revision 1.2 and LXI Trigger Bus Cable and Terminator Specifications Rev 1.1.
For proper operation, each trigger bus connector must be populated with either a cable or a
termination. Since the two connectors per unit are in parallel, they are electrically equivalent with
respect to receiving the cable or termination. VTI Instruments P/N: 70-0322-000 provides two
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specification of -0.5 V to 5.5 V. Exceeding that value with an external
INPUT
Characteristic
V
INPUT
V
IH
V
IL
V (I = -32 mA)
OH OH
V (I = 64 mA)
OL OL
T 3-2: D I/O P
ABLE IGITAL
Pin Function
1 +3.3 V
2 GND
RP_TRIG_P1
3
4 RP_TRIG_N1
5 GND
RP_TRIG_P3
6
7 RP_TRIG_N3
8 GND
RP_TRIG_P5
9
RP_TRIG_N5
10
11 RESERVED
12 RP_TRIG_P7
RP_TRIG_N7
13
1 2 3 4
14 15 16 17
T 3-3: T B
ABLE RIGGER US
Value
-0.5 V to 5.5 V
2 V min
0.8 V max
2 V min
0.55 V max
E S
ORT LECTRICAL PECIFICATIONS
www.lxistandard.org
Pin Function
14 RP_TRIG_P0
15 RP_TRIG_N0
RESERVED
16
17 RP_TRIG_P2
18 RP_TRIG_N2
GND
19
20 RP_TRIG_P4
21 RP_TRIG_N4
GND
22
RP_TRIG_P6
23
24 RP_TRIG_N6
25 RESERVED
5 6 7 8 9 10 11 12 13
18 19 20 21 22 23 24 25
C P A
ONNECTOR IN SSIGNMENT
EX1200 Series Basic Mainframe Operation
and refer to