BIXOLON SRP-270 service manual 4 I/F PBA Detect Block Diagram, PBA DIPC1 DIPC2 DIPC3

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

Rev. 3.02 - 34 -