BK-T680 User’s Manual
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6 Interface signal
6.1 RS-232 interface
6.1.1 Parameter
Data transfer mode:
asynchronous serial communication
Handshake mode:
RTS/CTS control
Voltage level:
MARK = -3 to -15 V: Logic "1"/ OFF
SPACE = +3 to +15 V: Logic "0"/ ON
Baud rate:
1200, 2400, 4800, 9600, 19200, 38400, 57600 bps
Data bit:
8 bit or 7 bit
Parity checkout:
None, even, or odd
Stop bit:
1 bit
Connector:
9 pins serial connector (negative head)
Note:
Serial baud rate, data bit, 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:
No.
Signal name
Signal direction
Function
1
NC
—
2
TXD
Output
Data output port
3
RXD
Input
Data input port
4
DSR
Input
Data set ready
5
GND
—
Signal ground
6
DTR
Output
Data terminal ready
7
CTS
Input
Allow to send
8
RTS
Output
Request to send
9
NC
—
Table 6.1-1 Interface and pin explanation
6.1.3 Demonstration of interface connection
Host side
Printer side
TXD---------------RXD
RXD---------------TXD
DSR---------------DTR
CTS---------------RTS
RTS---------------CTS
DTR---------------DSR
GND---------------GND
Note:
Please make sure the printer is turned on and wait for the end of initialization, then send data to
the printer.
