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Rev. 1.00
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SRP-F310/312
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 H L
IEEE1284 H L 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]