GDM-8261A User Manual
124
Digital I/O Terminal Configuration
Background
The digital I/O terminal outputs the result of Compare
measurements to control external devices. By providing
separate VCC power for the terminal, the outputs can also be
used as a power source for TTL and CMOS circuits.
Pin
assignment
Connector type: DB-9
female
6
FAIL Out
7 8 9
1 2 3 4 5
High Limit FAIL Out
VCC Out
NC
PASS Out
External Trigger In
EOM Out
LOW Limit FAIL Out
Digital (chassis) Ground
Pin1
VCC output, 5V. Serves as the unregulated max
power source for the external device/logic.
Without GPIB/LAN card: 4.5V/50mA
With GPIB/LAN card: 4.0V/50mA
Pin2
NC (No Connection).
Pin3
Digital (chassis) Ground.
Pin4
External Trigger Input. Accepts external trigger
signals. For using external signals, see page 119
(Scanner) or page 76 (Configuration).
Pin5-9
Pins 5-9 use open-collector outputs and thus
require a pull-up resistor for each pin. The
output resistor must have a minimum rating of
500
Ω
. All the outputs are active low.
Pins 5-9
output
wiring
diagram
Pin 1
Pin 5-9
Vo
R(min: 500
Ω)
Digital I/O
Terminal
