O B M
Chapter 2 Communication Interfaces
The OBM-2028 provides a TTL-232 interface and a USB interface to communicate with the host device.
The host device can receive scanned data and send commands to control the engine or to access/alter
the configuration information of the engine via the TTL-232 or USB interface.
TTL-232 Interface
Serial communication interface is usually used when connecting the engine to a host device (like PC,
POS). However, to ensure smooth communication and accuracy of data, you need to set communication
parameters (including baud rate, parity check, data bit and stop bit) to match the host device.
The serial communication interface provided by the engine is based on TTL-level signals. TTL-232 can
be used for most application architectures. For those requiring RS-232, an external conversion circuit is
needed. The conversion circuit is available only to some models.
Serial Communication
Default serial communication parameters are listed below. Make sure all parameters match the host
requirements.
Parameter
Factory Default
Standard TTL-232
Serial Communication
Baud Rate
115200
None
8
Parity Check
Data Bits
Stop Bits
1
Hardware Flow Control
None
10
