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6 Interface signal
6.1 RS-232 interface (optional)
6.1.1 Parameter
1)
Data transfer mode: asynchronous serial communication
2)
Handshaking mode: RTS/CTS
3)
Level：
MARK= -3 to -15 V: Logic "1"/ OFF
i.
4)
Baud rate： 1200, 2400, 4800, 9600, 19200, 38400, 57600 bps
5)
Data bit：
8 bit or 7 bit
6)
Parity checkout： None, even, or odd
7)
Stop bit：
1bit
8)
Connector： 9-pin serial interface connector (female type)
Note: Serial baud rate, data bit and parity bit are set by EEPROM.
6.1.2 Interface linking terminal distribution and signal function
Printer signal and status is described as the following table:
Pin
1
2
3
4
5
6
7
8
9
6.1.3 Demonstration of interface connection
Note: Please send data to the printer after the printer is powered on and finishes initializing.
SPACE = +3 to +15 V: Logic "0"/ ON
Signal name
Signal direction
—
RXD
TXD
DTR
SG
DSR
RTS
CTS
FG
Table 6.1.2 Interface and pin explanation
Host side
TXD---------------RXD
RXD---------------TXD
DSR---------------DTR
CTS---------------RTS
RTS---------------CTS
DTR---------------DSR
FG ---------------FG
SG ---------------SG
Input
Output
Output
—
—
Output
Input
—
Printer side
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BT-T080R User's Manual
Function
Receive data
Transmit data
Data terminal ready
Signal ground
Data set ready
Request to send
Allow to send
Frame ground
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