Toshiba B-SV4D Series Manual page 15

3. ELECTRONICS
Serial Interface Circuit
The RS-232 is asynchronous transfer. The RS-232 Circuit is for use with the externally
connected personal computer and keyboard unit. JP15 connects to PC serial interface
through the RS-232 cable. RxD is the data receive pin of MCU. CTS is the Clear To Send of
MCU, which sends the signal from the external device. TxD is the data output pin of MCU.
RTS is the Request To Send signal which MCU sends to the external device.
USB Circuit
This is standard USB 1.1.
Gap/Black Mark sensor
1. The Gap Sensor is penetrable sensor and with 64 levels.
2. Black Mark Sensor is reflecting sensor and with 64 levels.
3. The Gap Sensor activates when GAP& Black mark SW signal is HIGH; the Black Mark
sensor activates when GAP& BM_SW signal is LOW.
Head Open Sensor
The Head Open Sensor is a penetrable sensor. The voltage is LOW when the Print Head
opens; otherwise, it is HIGH.
Peel-off Sensor
The Peel-off Sensor signal voltage is HIGH when the paper is detected; otherwise, it is
LOW.
Cutter Drive/ Protection Circuit
The RESET signal is "High" when the printer is turned on, The cutter is activated when The
/CTEN signal is "low". And the CTPhase signal controls the rotated direction. The U15B
74HC123 controls the breaking of the DC Motor of the cutter. The sensor of cutter sends the
"Hi-Lo" signal to MCU through the CTSENS pin that detects the action of cutter.
3- 7
EO18-33013
3.3 Main PC Board