Getting Started
3-3
IN
— Displays the present status of the digital input on the
LED matrix. Logic high is indicated by a lit LED. The digital
input display status is continuously updated. Table 3-1 lists
digital input display formats.
OUT
— Displays the present status of the digital output on
the LED matrix. The output can be changed by clicking the
light pen on the appropriate LED. Output high is indicated
by a lit LED. Output low is indicated by an extinguished
LED. The digital output display status is updated when the
output is changed. Table 3-2 lists digital output display
formats.
3.2.2 Light pen connection
LIGHT PEN
— An optional input device for toggling the
on/off state of the crosspoint display LEDs and digital I/O
LEDs. One light pen is used to control the LEDs of up to five
Model 708A mainframes. Refer to Figure 3-1 for the loca-
tion of the light pen connection. Refer to paragraph 4.4.4 for
light pen operating information.
3.2.3 LED indicators
IEEE-488 Status Indicators
TALK, LSTN, REM
— These three LED indicators apply
to instrument operation over the IEEE-488 bus. The TALK
and LSTN indicators show when the unit has been addressed
to talk or listen. REM turns on to show when the unit is in the
IEEE-488 remote state. See Section 4 for detailed informa-
tion about operation over the bus.
Other Status Indicators
ERR
— This LED lights when an error condition is flagged.
The error condition is flagged in the serial poll byte when any
bits in the Error Status Word are set. Refer to paragraph
5.9.20 for information on sending the Error Status Word
(command U1).
COPY
— When this LED is lit, any change to the crosspoint
display is immediately sent to the relays. Refer to paragraph
3.2.4 for information on toggling the COPY LED.
3.2.4 Switches/connections
POWER
— The power switch turns the unit on or off. The
unit is on when the POWER pushbutton is in (depressed) and
off when the POWER pushbutton is out.
CAUTION
The position of the POWER pushbutton
indicates the power status of the Model
708A Switching System. The status of
the crosspoint display and the other
LEDs are not indications of power being
applied to the Model 708A.
Table 3-1
Digital input display formats
Row/Column
Input #
Row/Column
Input #
A1
B1
C1
D1
E1
F1
G1
H1
1
2
3
4
5
6
7
8
A2
B2
C2
D2
E2
F2
G2
H2
9
10
11
12
13
14
15
16
Table 3-2
Digital output display formats
Row/Column
Output #
Row/Column
Output #
A11
B11
C11
D11
E11
F11
G11
H11
1
2
3
4
5
6
7
8
A12
B12
C12
D12
E12
F12
G12
H12
9
10
11
12
13
14
15
16
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