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INSTRUCTION MANUAL
Control Unit
Model 780
OCOPYRIGHT 1975 KEITHLEY INSTRUMENTS, INC.
FIRST PRINTING, NOV. 1975, CLEVELAND, OHIO, U.S.A.
DOCUMENT NO. 27444, REVISION CODE AA.
INSTRUCTION MANUAL
Control Unit
Model 780
CONTENTS
Section Pag1
CONTENTS . . ii
ILLUSTRATIONS: 1 1 1 1 1 1 1 1 1 1 1 1 1 1 : 1 1 1 1 1 1 1 1 1 1 1 1 : : 1 .' '. *
* iii
SPECIFICATIONS . . . . iv
I. GENERAL INFORMATION: : : : : : : : : : : : : : : : : : : : : : : : : : : ' ' l-i
I-l * GENERAL INFORMATION. + . . . . . . . . , . . . . . . . . . . . . . : : I-l
l-2. WARRANTY INFORMATION . . . . . . . . . , . . . . . . , . . , . . . . , l-l
1-3. CHANGES. . , . . l-l
2. INITIAL PREPARATION. . : : : : : : : : : : : : : : : : : : : : : : : : : : : 2-i
2-l. GENERAL. . . , . 2-l
2-2. INSPECTION...:::::::::::::: ::I:::::::::: 2-l
2-3. SYSTEM CONSIDERATIONS. 2-l
2-4. HOW TO INSTALL INTERFACk: : : : : : : : : : : : : : : : : : : : ' ' : 2-l
2-5. HOW TO RACK MOUNT THE CONTROL UNIT . , . . . . . . . . . . . . . : : . 2-2
2-6. HOW TO APPLY POWER TO THE CONTROL UNIT . . . . . . . , . , . . . . . . 2-2
2-7. HOW TO USE REAR PANEL CONNECTORS . . 2-5
3.' INTERFACE CONSIDERATIONS . . . . . . . . . : : : : : : : : : : : : : : : : : 3-l
GENERAL. . . . . . . . . 3-I
;::: INTERFACE BUS CONFIGURATI;N: : : : : : : : : : : : : : : : : : : : : : 3- I
3-3. SCANNER INTERFACE. . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
\. THEORY OF OPERATION. 4-l
GENERAL....::::::::::::::::::::::::::::
;::: CIRCUIT DESCRIPTION. . . . . . . . . 44:;
4-3. HOW TO INTERPRETTHE FRONT PANEL INDICAT;)R; : : : : : : : : : : : : : : 4-6
j. MAINTENANCE.
5-l. GENERAL: :::::I ::: ::::::::::I ::::::::::: ;:1'
REQUIRED TEST EQUIPMENT. . . . . . . . . . . . . . . . . . . . . . . , 5- I
:::: PERFORMANCE VERIFICATION . . . . . . . . . . . . . . . . . . . . . . .
I. ACCESSORIES. . . , . 2:;
RACK MOUNTING KiT: : : : : : : : : : : : : : : : : : : : : : : : : : : 6-l
66::. . MULTI-SCANNER COUPLER (Model 7819-MSC)
6-2
6-3. INTERFACE EXTENDER CARD (Model 7819-IECj : : : : : : : : : : : : : : :
6-4. CUSTOM INTERFACE (Model 7802~CIK). . ;I;
6-5. DUAL CONTROL UNIT COUPLER (Model 7819:DCCj : : : : : : : : : : : : : : 6-5
. REPLACEABLE PARTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7-l. GENERAL. . . . , ;:;
7-2. ORDERING INFORMATiON : : : : : : : : : : : : : : : : : : : : : : : : : 7-l
7-3. SCHEMATICS. . . . . . . . . ~. . . . . . . . . . . . . . . . . . . . 7-l
..
INSTRUCTION MANUAL
Control Unit
Model 780
ILLUSTRATIONS
Figure
No. Title Page
I Front Panel ............................ l-2
Rear Panel .......................... i-2
: Installation of, Series 7801, 7802, 7819-IEC and 7813 Cards. , . : : 2-3
4 installation of Dual Control Unit Coupler (Model 7819-DCC). .... 2-4
Top View of Control Unit With Cover Removed ............ 2-6
2 Card-edge Connector (JIOI, JlO2, or JlO3) 3-2
Scanner Connector (PIlO). . ... . ... 1 1 1 1 : 1 1 1 1 : 1 1 1 3-3
; Front Panel Indicators.
9 Trace for Test #I ... : : : : : : 1 : : : : : : : : : : : : : : : ;:;
IO Trace For Test #2 ......................... 5-3
11 Trace For Test #3 ......................... 5-4
12 Trace For Test #4 ......................... 5-5
13 Trace For Test #5 ......................... 5-6
14 Trace For Test #6 .........................
15 Trace For Test #7 .................... ;:;
16 Trace For Test #IO. ................... : : : : : S-11
I7 Trace For Test #Il. ........................ 5- 12
la Trace For Test #I3. ........................ 5- 15
I9 Trace For Test #14. ........................ S-lb
20 Trace For Test #15. ........................ 5-17
21 Trace For Test #l6. ........................ s-18
22 Trace For Test #lg. ........................ 5-24
23 Trace For Test #20. ........................ 5-25
24 Trace For Test #21. ........... 5-26
25 Trace For Test #22. ........... : : : : : : ! : : : : : : 5-27
26 Rack Mounting of the Control Unit .................
27 Multi-Scanner Coupler (Model 7819-MSC). .............. 2::
28 Typical System I Multi-Scanner Connection ............. 6-3
Custom Interface (Model 7802~CIK) ................. 6-6
:i Chassis Assembly. ......................... 7-3
31 Component Layout For PC-395 .................... 7-11
AA iii
INSTRUCTION MANUAL
Control Unit
Model 780
SPECIFICATIONS
GENERAL: Holds up.to three System I Instrument Interface or special-purpose
cards. Supplies power to cards. Captive cable plugs directly into the
System I Programmable Calculating Unit.
DISPLAY: 18 LED lamps indicate the last Output B-bit word transferred, the
next B-bit word to be Input, and whether the last word transferred was Data
or Control.
CONTROLS: Front panel power switch. Internal switch sets* Control Unit address.
702/702X INTERFACE:
GENERAL: Built-in interface connects directly to one Model 702/702X IO-
channel Scanner, or with 7819-MSC, to as many as eight lo-channel Scanners
for random access to single channels. For parallel-channel or matrix op-
eration, one channel on each Scanner may be selected.
OUTPUT INSTRUCTION:
Control Transfer: Deactivates all or selectively activates one of up to
80 channels.
Power up/Reset: All scanner channels Off.
Nominal Instruction Time: 70 milliseconds.
ISOLATION (PCU GROUND TO ANALOG LO): Provided by Model 702X plug-in cards.
ENVIRONMENT:
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