Getting Started
3-5
EXT TRIGGER INPUT
— A BNC jack for applying a
trigger pulse to change to the next relay setup, if triggers are
enabled and TRIG ON EXT is selected as the source. Pulses
must be TTL-compatible, negative- or positive-going (pro-
grammable edge), with a duration greater than 600ns. Refer
to the external trigger device-dependent command (DDC) in
paragraph 5.9.2.
MATRIX READY OUTPUT
— A BNC jack providing a
TTL-compatible, high- or low-true level. It goes false when
relays are switched and goes true after the sum of the relay
settling time and the programmed settling time. Refer to the
matrix ready device-dependent command (DDC) in para-
graph 5.9.3.
MASTER/SLAVE OUT
— An 8-pin DIN connector for
connecting a cable to the next switching system in a master/
slave daisy-chain configuration.
MASTER/SLAVE IN
— An 8-pin DIN connector for con-
necting a cable from the previous switching system in a mas-
ter/slave daisy-chain configuration.
DIGITAL I/O
— Two DB-25 connectors.
Input
— Sixteen inputs with internal pull-up resistors
provide level shifting for direct micro-switch monitor-
ing. Maximum voltage is 42V (peak).
EXT TRIG
INPUT
MADE IN U.S.A.
MATRIX READY
OUTPUT
DIGITAL INPUT
DIGITAL OUTPUT
IEEE-488 INTERFACE
IEEE-488
ADDRESS
IN
OUT
WARNING:
TIGHTEN MOUNTING SCREWS TO ENSURE PROPER CHASSIS GROUND
REFER TO MANUAL FOR PROPER BACKPLANE CABLE INST.
MASTER/
SLAVE
MASTER/
SLAVE
1
2
3
4 5 6
7
8
1
2
3
4 5 6
7
8
LINE RATING
90-250V
50-60 HZ
110 VA MAX
WARNING:
NO INTERNAL OPERATOR SERVICEABLE PARTS.
SERVICE BY QUALIFIED SERVICE PERSONNEL ONLY
INSTRUMENT INTERNALLY FUSED.
!
KEITHLEY
2
2
3
3
4
4
5
5
6
6
8
8
9
9
0
0
1
1
7
7
Figure 3-5
Model 708A rear panel
Output
— Sixteen open collector drivers with factory-
installed 10k
Ω
pull-up resistors. Each driver has internal
flyback diodes. Pull-up voltage is 5V at 65mA maxi-
mum. External connections are provided for user sup-
plied voltage (40V maximum). Maximum sink current is
600mA per channel. Output short-circuit protection is
provided up to 25VDC.
Refer to paragraph 4.6.1 for more information on the dig-
ital I/O ports.
IEEE-488 INTERFACE
— This connector interfaces the
Model 708A to the IEEE-488 bus. Refer to paragraph 4.6.5
for more information on the IEEE-488 interface port.
IEEE-488 ADDRESS SWITCHES
— Two rotary switch-
es set GPIB (IEEE-488) addresses and also designate master/
slave units. From the factory, these switches are set to a GPIB
address of 18. Valid switch settings are shown in Table 3-3.
Refer to paragraph 4.6.5 for more information on the IEEE-
488 interface port.
AC RECEPTACLE
— Power is applied through the sup-
plied power cord to the three-terminal AC receptacle.
Table 3-3
IEEE-488 address switches
System type
Switch settings
Stand-alone unit
Slave of a master/slave system
Master of a master/slave system
0 to 30
0 to 30
31 to 60
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