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S
T
CANNER
ERMINATIONS
IS4125-17 Connector Pin Assignments
Metrologic provides a low profile ZIF 12-pin
connector to connect to a 1 mm x 12 position
FFC/FPC cable. The pin assignments are as follows:
Pin
Signal Name
1
VCC
2
Ground
3
Receive
4*
PC Data
5*
PCClock
6*
KB Clock
7
Transmit
8*
KB Data
Good Read
9
Indicator
10
Beeper -
11
Reserved Input
12
LED -
* Pins 4, 5, 6 and 8 main function is to transmit scan codes between the
Keyboard Wedge and PC.
Input. 5VDC (± 0.25V)
This requires 25 mA in standby and 130 mA peak.
Signal and power ground.
Input. Keyboard Wedge receive data from host.
PCData
PCClock
KB Clock
Output. RS232 transmit data from the scan engine.
KB Data
Output. 5V high with a 2 kHz pulse. This drain is the pin
of a PFET type transistor that can source approximately
100 mA of current. This output is the connection for an
LED or other indicator (i.e. beeper+). It is recommended
that the indicator is terminated directly to ground.
Input. Collector of an NPN transistor that can sink
approximately 100 mA of current. A current limiting pull-
up resistor and Piezo type transducer (QMB- 111PXN or
equivalent) is recommended.
Input. Do not connect to this pin, Metrologic internal use
only.
Negative connection for scan mode indicator.
An external pull-up and LED are suggested. Maximum
current is limited to 25 mA. This line is active low when
the scanner is in the scanner mode (i.e. scan line is
present).
1
Figure 5
Function
12
15
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