HP 5305 B - Page 39

Model 5305B
Circuit Dia
g
rams
Table 9E-8-1. Counter Signal List (Continued)
9E-8-2
Low signal provides print command to rear panel connector on
mainframe.
Low signal transfers data to display. High signal stores data.
Time base select code A, B, and C determines the time base
frequency at the time base output, pin 18.
Full wave rectified voltage from the power transformer secondary.
Provides power to charge the battery pack. If no battery pack is
used, pin 25 is connected via the plug-on to pin 50 (DC-IN).
Pins 27 through 31 provide the drive to the annunciator lights
on the front panel. A low signal lights the corresponding
indicator.
Low signal from front panel pushbutton switch or rear panel input
clears the system to zero.
Low signal activates decimal point 1.
Low signal activates decimal point 2.
Digit address code X, Y, Z from the display scanner
indicates which data digit is being displayed.
Digit select code X, Y, Z is the code that selects the mainframe counter
digit that is to be displayed. If the mainframe counter is displayed
directly, the corresponding lines of the digit address code and the digit
select code are connected together.
T
h
e
d
ata co
d
e
A
, B,
C
, D represents t
h
e
di
g
i
t to
b
e
di
sp
l
aye
d
i
n
binary coded decimal form. Data lines can carry the mainframe
counter information to the plug-on as well as to the display or can
bypass the counter and bring plug-on data to the display.
Low signal activates decimal point 3.
Low signal activates decimal point 4.
Low signal activates decimal point 5.
Common power and signal return line.
DC Power to power supply from battery pack or from 22 volt
input power at pin 25.
PIN NO. SIGNAL NAME DESCRIPTION
19 PRINT
20 TRANSFER
21 1 MHz TIME BASE INPUT
22 TIME BASE SELECT A
23 TIME BASE SELECT B
24 TIME BASE SELECT C
25 +22 V
26 +17 V
27 Hz
28 M
29 S
30 K
31 u
32 MAN RES
33 DP1
34 DP2
35 NC
36 DIGIT ADDRESS X
37 DIGIT SELECT X
38 DIGIT ADDRESS Y
39 DIGIT SELECT Y
40 DIGIT ADDRESS Z
41 DIGIT SELECT Z
42 DATA "D"
43 DATA "C"'
44 DATA "B"
45 DATA "A"
46 DP3
47 DP4
48 DP5
49 COMMON RETURN
50 DC IN