Df-Ack Signal, Df-Req Signal And Rxd Signal - Toshiba MR-3011 Service Manual

11.2 DF-ACK Signal, DF-REQ Signal and RxD Signal

8
CN2.8 DF-ACK
9
CN2.9 DF-REQ
4
CN2.4 RxD
This circuit is an output circuit for communication with the scanner. The output is "1" for 5V and "0" for 0V. The
logic for the connector area and that for the output port of CPU are the same.
October 2000 © TOSHIBA TEC
C 5
1
Q2.1
B
E 2
R4
1 2
SGND
C 4
3
Q2.2
B
E 2
R5
1 2
SGND
R7
1 2
C 4
3
Q1.2
B
E 2
R6
1 2
SGND
IC2.5
R1
1 2 10
Y A
IC2.4
R2
1 2 8
Y A
+5V
IC2.6
R3
1 2 12
Y A
11-2 MR-3011/3012 INPUT/OUTPUT SIGNALS
+5V
1
TP6
R11
2
11 1
+5V
1
TP2
R12
2
9 1
+5V
1
TP4
R13
2
13 1
DF_ACK
DF_REQ
TXD