User's Manual

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2. Communication Interface
2-1. RS-232 Serial Interface
RS-232 is developed according to the EIA standard asynchronous transmission, the specifications
are as following:
Ø Data transmission: serial interface
Ø Synchronization: asynchronous
Ø Signal Level: RS-232 level, logic 1:-5.4v, logic 0 : +5.4v
Ø Hardware Flow Control: None
Ø Baud rate: 2400pbs to 115200pbs is optional
Ø Data word length: 8 bits
Ø Stop bit: 1bit
Ø Parity: None
Users can get the current baud rate from the printer self-testing page.
Serial cable: We have made the cable specially using mini port like Mini USB port which connects
the printer .The following picture shows the signal definition of the RS-232 Serial interface:
The connection between the printer and host follows the following rules:
Printer Host
TXD RXD
RXD TXD
GND GND
However, the printer usually works only on receiving data, it doesn’t have to respond anything back
to the host , then TXD signal can be ignored , and then the connection can be sampled as
following:
Printer Host
RXD TXD
GND GND