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4.3
MAIN BOARD PIN ASSIGNMENTS (J1 Card Edge)
Left to right, looking at rear of case
P1 Connection
A
B
C
D
E
F
H
J
K
L
M
N
P
R
S
T
U
V
Standard
Spare (E16)
1
No connection
No connection
2
Spare (E18)
Spare (E19)
3
No connection
No connection
4
No connection
Spare (E43)
5
No connection
1999.9 (DP4)
6
Spare (E24)
199.99 (DP3)
7
Spare (E23)
19.999 (DP2)
8
Spare (E22)
1.9999 (DP1)
9
Spare (E25)
Decimal point select
10
Spare (E26)
Spare (E27)
11
–4.6 Vdc power output
Spare (E29)
12
+4.7 Vdc power output
– Excitation voltage
13
+ Reference voltage
LAMP TEST (lights display segments)
14
+ Excitation voltage
Digital ground
15
HOLD (holds last display reading)
Analog Ground
16
Spare (E32)
BLANKING (blanks 4 least-significant digits)
17
Spare (E34)
Oscillator (100 kHz output)
18
No connection
7
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