Copyright 2008 Unitech Electronics Co., Ltd. All rights reserved. Unitech is a registered trademark of Unitech Electronics Co., Ltd.
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Copyright 2008 Unitech Electronics Co., Ltd. All rights reserved. Unitech is a registered trademark of Unitech Electronics Co., Ltd.
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Setting DIP Switches

NOTE: Be careful when changing the DIP switch settings. Carefully use a pointer on the DIP switch you are
going to change. DO NOT use a screw driver or apply excessive force.

DIP Switch Functions

DIP
Switch Function Switch Switch Switch Switch Notes
1,2,3,6 Communication Interface SW1 SW2 SW3 SW6
RS232 Off Off Off Also set 4 & 5
IrDA On On Off Also set 4 & 5
Bluetooth Off On On 38,400 Baud
IR Direct Mode On On Off On 9600 Baud
4 & 5 COM 1 & 2 - Baud Rate SW4 SW5 RS232 Rate
38, 400 Off Off Bluetooth
19, 200 Off On
9600 On Off
2400 On On
4 & 5 COM 2 – IrDA Baud Rate SW4 SW5 IrDA Baud Rate
9600 Off Off Fixed
9600 - 38.4 Baud On Off Variable
6 & 7 COM 1 & 2 - Parity Bits SW6 SW7
No parity Off Off
Odd parity On Off
Even parity On On
8 Auto Power Save SW8
Power save disabled Off Manual On/Off
Power save enabled On Auto Power Down
NOTE: In order for changes to the DIP Switch conguration to take effect, the printer’s power must be reset.
Communication
• The MP300 has two serial communication UARTs. It is able to support two modes
of communication simultaneously – either RS232 and IrDA (If DIP switch 1 is on)
or RS232 and Bluetooth (If DIP switch 1 is off and DIP switch 3 is on).
• DIP switch 2 is used to control the RS232 port. If the switch is turned on the
RS232 Port is disabled and if it is turned off the RS232 Port is enabled. If RS232
interface is not required, disabling the port will save battery power.
• Bluetooth communication is available if optional daughter boards are installed.
Serial Communication Specication
• The RS232 interface signals for the MP300 printers are terminated on a
6-pin RJ type data connector located on the side of the printer.
• Six connections are provided from the serial interface to the host computer. The
serial interface signals and pin outs on the RJ connector, and the connector
pin locations are shown below.
• A minimum of two connections are required for operation: RXD – pin 3 and Common
– pin 1.
The communication parameters: baud rate, data bit and parity must be set the same
as the host device settings.
RJ45 Connector Pin # Communication Interface Signal Name
3RS232 from host (Input) RXD
2RS232 from printer (Output) TXD
6Request to send from host (Input) RTS
4Clear to send from printer (Output) CTS
1, 5 Logic common COM
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