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Host Interface Connector
The following table lists the pin functions of the 12-pin host interface connector on the EM1399-LD.
PIN#
Signal Name
1
NC
2
VDD
3
GND
4
RX
5
TX
6
USB_D-
7
USB_D+
8
PWRDWN
9
Buzz
10
LED
11
NC
12
nTrig
11
Chapter 4 Interfaces
I/O
-
Not connected.
-
3.3V
power supply.
-
Power-supply ground.
I
TTL level 232 receive data.
O
TTL level 232 transmit data.
I/O
USB_D- differential data signal.
I/O
USB_D+ differential data signal.
Low Power State signal output: Active high indicates that the
O
engine is in low power state.
Beeper output. For the information of beeper driver circuit, see the
O
Beeper section in this chapter.
Good Read LED output. For the information of LED driver circuit,
O
see the Good Read LED section.
-
Not connected.
Trigger signal input: Driving this pin low for at least 10ms causes
I
the engine to start a scan and decode session.
Function
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