Lukhan LK-T21 - Configuration; Interface Overview and RS-232 Specifications

LK-T21 Technical Manual
2. Configuration
2.1 Interface
2.1.1 RS-232 serial interface
2.1.2 Specifications
Data transmission: Serial
Synchronization: Asynchronous
Handshaking: DTR/DSR or XON/XOFF control
Signal levels: MARK= -3 to –15V: Logic “1”
SPACE= +3 to +15V: Logic “0”
Baud rage: 4800, 9600, 19200, 38400 bps
Data word length: 7 or 8 bits
Parity Settings: None, even, odd
Stop bits: 1 or more
Connector (printer side): Female DSUB-25 pin connector
NOTE: The data word length, baud rate, and parity depend on the
DIP switch settings.
2.1.3 Switching between on-line and off-line
The printer does not have an on-line/off-line switch.
The printer goes off-line:
•Between when the power is turned on (including reset using the interface) and when the
printer is ready to receive data.
•During the self-test.
•When the cover is open.
•During paper feeding using the paper feed button.
•When the printer stops printing due to a paper-end (in cases when an empty paper supply
is detected by either paper roll end detector or the paper roll near-end detector with a
printing halt feature by
ESC c4).
•During macro executing stand by status.
•When a temporary abnormality occurs in the power supply voltage.
•When an error has occurred.
2.1.4 Interface connector terminal assignments and signal functions
PIN SIGNAL I/O DESCRIPTION
2 TXD - Printer transmit data line RS-232C level
3 RXD - Printer receive data line RS-232C level
4, 20 DTR Output Printer handshake to host line RS-232C level
6 DSR Input Data Send Ready
1,7 GND - System Ground
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