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Installation Manual

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Chapter 4 Interfaces
Communication Interface :
The E4000 communicates with the host computer in the following ways:
TTL TTL level signal (TTL-232): This interface accommodates most system architectures. For some systems that require an
RS-232 form factor, a TTL-232 to RS-232 conversion circuit is required.
USB HID-KBW: A USB-based keyboard emulation device that can be directly connected to a PC without the need to
install a driver.
The TTL-232 serial communication interface available on the E4000 supports speeds from 2400bps to 115200bps. The
default configuration of the serial communication interface of the E4000 is 9600bps, 8 data bits, no parity, and 1 stop bit.
The hardware flow control and software flow control functions of the serial communication interface are not provided on the
E4000.
Trigger control
The nTrig pin (PIN12) indicates a trigger on a low level input and a high level indicates that the trigger is stopped (or
released). The E4000 starts reading after receiving the trigger. After the reading is successful, it will output the decoding
information, and then wait for the trigger signal to stop (or release). During the reading process, the trigger signal is stopped
(or released) and the reading process is terminated. A new reading process requires a re-generation of the trigger signal.
The reading process requires steps such as image acquisition, barcode recognition and interpretation. It is recommended that
the interval between two trigger signals be no less than 50ms. Refer to the following trigger circuit
design: