Manual

DT220 Users Manual version 1.a Hardware & Wiring
41
P.C. Board Diagram - Connectors, Jumpers, and Switches
NOTE: Jumper TB3 pin 7 to ground (TB6 pin 7) to enable scale configuration and
calibration. Remove the jumper if the unit is to be sealed by Weights & Measurement
authorities after calibration.
Power Supply
TB4
Display
Connector
Keyboard Connector
JP1
C
o
m
2
1
2
3
4
5
6
7
+
A/D
Remove
JP1 for
floating
ground
TB3
TB2
TB1
20
1
TTL In
1 2 3 4 5 6 7
Com 1
1 2 3 4 5 6 7
TTL Out
1 2 3 4 5 6 7
TTL Out
1 2 3 4 5 6 7
Com 3
1 2 3 4 5 6 7
L
O
A
D
C
E
L
L
1
2
3
4
5
6
7
Fuse
Com 1
Com 2
Com 3
1
MMC
Display Backlight
Connector
Parallel Printer Port PC Kbd
TB6
Trim pot to adjust display pixel intensity
Jump TB3
terminal 7 to TB6
terminal 7 to
disable
Calibration LOCK
Remove to
enable LOCK