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RT20
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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
Serial Communication
Standard TTL-232
Baud Rate
9600
Parity Check
None
Data Bits
8
Stop Bits
1
Hardware Flow Control
None
