3-4 i/f pba detect block diagram, Srp-270, Rev. 3.02 – BIXOLON IMPACT PRINTER SRP-270 User Manual
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Rev. 3.02
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SRP-270
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.
First, The CPU sends a “I/F Sel “ signal (P7.3) to I/F PBA. The I/F PBA has the three return Signal
(DIPC1~C3).
The CPU recognize the I/F PBA by the value of the three return signal.
I/F PBA
DIP_C1
DIP_C2
DIP_C3
RS-232C L
L
H
RS-485 L
H
L
IEEE1284 H
L
L
USB2.0 H
H
L
No Connection
L
L
L