BIXOLON 352plusA - Manual (Page 37)

Rev. 2.01 - 37 -
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.
[Figure 4-8 RS-232C Communication Block Diagram]
[Figure 4-9 RS-232C Communication Waveform]
UPD70F3107
TXD,DTR
RXD,DSR