VTI Instruments EX1000A - LXI Trigger Bus

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EX10xxA Triggering 65
channel is linked as a DIO Limit Event, this is noted in the direct control mechanism as a pseudo-
warning to guard against accidental use.
The default selections for each DIO channel are:
 output enable is off
 output level is 0
The default selections for DIO Limit Events are:
 all channels are disabled
 invert is off
 latch is off
The electrical specifications for the digital I/O port are provided in Table 3-8. Particular note should
be given to the V
INPUT
specification of -0.5 V to 5.5 V. Exceeding that value with an external voltage
source, even though a resistance, could permanently damage the EX10xxA.
Characteristic
Value
V
INPUT
-0.5 V to 5.5 V
V
IH
2 V min
V
IL
0.8 V max
V
OH
(I
OH
= -32 mA)
2 V min
V
OL
(I
OL
= 64 mA)
0.55 V max
TABLE 3-8: DIGITAL I/O PORT ELECTRICAL SPECIFICATIONS
LXI TRIGGER BUS
The EX10xxA series provides an LXI 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 LXI Trigger Bus and creating an appropriate cable, please visit
www.lxistandard.org and refer to LXI Standard Revision 1.2 and LXI Trigger Bus Cable and
Terminator Specifications Rev 1.1.
Pin
Function
Pin
Function
1
+3.3 V
14
RP_TRIG_P0
2
GND
15
RP_TRIG_N0
3
RP_TRIG_P1
16
RESERVED
4
RP_TRIG_N1
17
RP_TRIG_P2
5
GND
18
RP_TRIG_N2
6
RP_TRIG_P3
19
GND
7
RP_TRIG_N3
20
RP_TRIG_P4
8
GND
21
RP_TRIG_N4
9
RP_TRIG_P5
22
GND
10
RP_TRIG_N5
23
RP_TRIG_P6
11
RESERVED
24
RP_TRIG_N6
12
RP_TRIG_P7
25
RESERVED
13
RP_TRIG_N7
1 2 3 4 5 6 7 8 9 10 11 12 13
14 15 16 17 18 19 20 21 22 23 24 25
TABLE 3-9: TRIGGER BUS CONNECTOR PIN ASSIGNMENT