BIXOLON service manual SRP-350/352plusA&C, 4-3-4 I/F PBA Detect Block Diagram, UPD70F3107

SRP-350/352plusA&C

4-3-4 I/F PBA Detect Block Diagram

When the printer is ON, the printer checks what kind of the I/F PBA is installed. After detection, the CPU specify the I/O port properly. The following is the method of I/F PBA detection.

The I/F PBA has the three return Signal (MD0~2).

The CPU recognize the I/F PBA by the value of the three return signal.

I/F PBA	MD0	MD1	MD2
RS-232C	L	L	H
IEEE1284	H	H	H
USB2.0	H	L	H
ETHERNET	L	H	L
No Connection	L	L	L

4-3-5 RS-232C Communication Block Diagram

The CPU is used for serial communication. And also RS-232C Driver (MAX232), is used to serial communication. Show following block diagram.

UPD70F3107

TXD,DTR

RXD,DSR

[Figure 4-8 RS-232C Communication Block Diagram]

[Figure 4-9 RS-232C Communication Waveform]

Rev. 2.01 - 37 -