Newland NLS-EM1399-LD, Руководство по интеграции

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