15
12-pin FPC Connector
The following table lists the pin functions of the 12-pin FPC connector.
Table 4-1
PIN#
Signal
I/O
Function
Remark
1
NC
-
Not connected
2
VIN
-
Power supply input
3
GND
-
Power-supply ground
4
RXD/USB_D-
I
TTL level 232 receive data/ USB D- differential data signal
5
TXD
O
TTL level 232 transmit data
6
nCTS/USB_D+
I
TTL level 232 clear to send /USB D+ differential data signal
7
nRTS
O
TTL level 232 request to send
8
PWRDWN
O
Power On LED output
See Note 1
9
nBEEPER
O,od Beeper output
See Note 2
10
nGoodRead
O,od Good Read LED output
See Note 3
11
PIN11
-
Reserved
Not connected
12
nTRIG
I
Trigger signal input
See Note 4
※
I = Input; O = Output; od = Open Drain;
※
1 This output signal can be used by an external LED to indicate power-on status.
The PWRDWN pin (PIN 8) produces a high output when the scan engine is powered on.
For the external LED circuit design, please see the
“Power On LED Circuit” section in this chapter. If the PWRDWN pin
is not used, leave it unconnected.
※
2 This output signal can be used by an external beeper circuit to generate audible feedback to the user to indicate
power-on and good read statuses.
Power On beep:
The nBEEPER pin (PIN 9) produces a PWM output (duration: 400ms; frequency: 4184Hz, both
parameters are
NOT
user-programmable) 940ms after power-on. The beep can be programmed On or Off. To learn
how to program the parameter, please see the EM20-M37 user guide.
Good Read beep:
The nBEEPER pin (PIN 9) produces a PWM output (default duration: 80ms; default frequency:
2730Hz, both parameters are user-programmable) when a good read occurs. The beep can be programmed On or Off.
To learn how to program these parameters, please see the EM20-M37 user guide.
For the external beeper circuit design, please see the
“Beeper Circuit” section in this chapter. If the nBEEPER pin is
not used, leave it unconnected.
※
3 This output signal can be used by an external LED to indicate good read status.
The nGoodRead pin (PIN 10) produces a low output (default duration: 20ms, user-programmable) when a good read
