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Communication Interfaces
The EM20 can communicate with the host device via its TTL-232 interface. This interface is applicable to
most system architectures. For those requiring RS-232, a TTL-232 to RS-232 conversion circuit is
needed.
The EM20's TTL-232 interface supports baud rates from 1200bps to 115200bps; it does not support
hardware flow control. Its default settings are 9600bps, 8 data bits, no parity check and1 stop bit.
Besides, the EM20 can also communicate with the host device via its USB interface (optional).
1. USB HID-KBW: Based on USB connection, the engine's transmission is simulated as USB keyboard
input. It works on a Plug and Play basis and no driver is required.
2. USB COM Port Emulation: The USB interface on the host device is emulated as a serial port with the
same data transmission and configuration as a real serial port. A driver is required.
3. USB HID-POS: It is based on HID with no need for custom driver and is way more efficient in
communication than keyboard emulation and traditional RS-232 interface.
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