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3.4 INPUT WIRING
The Large Display has two signal inputs, A and B. These inputs are wired to
terminal block TBB located inside the unit on the right side.
Terminal 1: Input A
Terminal 3: Input B
Terminal 2: Input Common
Programmable models LD2006P0 and LD4006P0 provide a choice of eight
different Count Modes. The Count Mode selected determines the action of
Inputs A and B. Section 5.1, Input Setup Parameters, provides details on count
mode selection and input action.
CAUTION: User common is NOT isolated from input common. In order to preserve the safety of the meter application, the DC common must be suitably
isolated from hazardous live earth referenced voltage; or input common must be at protective earth ground potential. If not, hazardous voltage may
be present at the User Input and Input Common terminals. Appropriate considerations must then be given to the potential of the input common with
respect to earth ground.
Magnetic Pickup
ON
1
INP A
1
2
3 4
2
INP COMM
3
INP B
TBB
4
+EXC
5
RESET/USER
COMM
6
7
COMM
Current Sinking Output
ON
INP A
1
1
2
3 4
2
INP COMM
3
INP B
TBB
4
+EXC
5
RESET/USER
COMM
6
7
COMM
Switch or Isolated Transistor; Current Sink
ON
1
INP A
1
2
3 4
2
INP COMM
3
INP B
TBB
4
+EXC
5
RESET/USER
6
COMM
7
COMM
Switch position is application dependent.
*
3.5 SERIAL WIRING
The serial connections are made via terminal block TBD located inside the
unit on the left side for the LD2 and on the right side for the LD4.
1
TXD
232
2
RXD
COMM
3
TBD
4
A
485
5
B
AC Inputs From Tach Generators, Etc.
Input A
ON
MAGNETIC PICKUP
1 2 3 4
TBB
Current Sourcing Output
Input A
ON
NPN
O.C.
1 2 3
4
TBB
Switch or Isolated Transistor; Current Source
Input A
ON
1 2 3
4
TBB
All other models are non-programmable and provide Count with Direction
Mode only. Input A accepts the count signal, while Input B controls the count
direction (up/down).
Input B can also be used to adjust the LED display intensity by setting DIP
Switch 8 to the ON position (See Section 2.0, Setting the DIP Switches). For
programmable models, this only applies in Count with Direction mode.
Input A
1
INP A
AC
2
INP COMM
Resistor to
limit current
3
INP B
to 2.5 mA MAX.
4
+EXC
5
RESET/USER
COMM
6
7
COMM
Input A
1
INP A
2
INP COMM
3
INP B
PNP
4
+EXC
O.C.
RESET/USER
5
COMM
6
7
COMM
Input A
1
INP A
2
INP COMM
3
INP B
+EXC
4
5
RESET/USER
COMM
6
7
COMM
5
Two Wire Proximity, Current Source
ON
1
INP A
1 2
3 4
2
INP COMM
2.2 kΩ
3
INP B
TBB
4
+EXC
RESET/USER
5
6
COMM
7
COMM
Interfacing With TTL
ON
1
INP A
1 2 3 4
2
INP COMM
3
INP B
TBB
4
+EXC
5
RESET/USER
COMM
6
COMM
7
Current Sink Output; Quad/Direction
ON
INP A
1
1 2 3 4
2
INP COMM
3
INP B
TBB
+EXC
4
5
RESET/USER
6
COMM
COMM
7
LD2006P0 and LD4006P0 only.
Shaded areas not recommended for counting applications.
Input A
Input A
+5 V
COMMON
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