12
Cable Connection
Be sure the power is cut off before connecting a flexible cable to the host interface connector on the
EM3090. Hot plugging could damage the engine or the host device.
Connect the EM3090 to a host device with a 12-pin flexible cable as shown in the following figure.
Communication Interfaces
The EM3090 can communicate with the host device through either TTL-232 serial port or USB port using
one of the following communication modes.
TTL-232: This interface is applicable to most system architectures. For those requiring RS-232, a
TTL-232 to RS-232 conversion circuit is needed.
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.
USB COM Port Emulation: The USB port 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.
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.
The EM3090
’s serial port supports baud rates from 1200bps to 115200bps; it does not support hardware
flow control.
