Chapter 6. Down Load Function - Sharp ER-A450 Service Manual

CHAPTER 6. DOWN LOAD
FUNCTION
1. General
RAM data can be transmitted in the following two methods.
Save the data before servicing as follows:
¬¾¾®
1
ECR ECR
·
Cable: 9 pin D-SUB – 9 pin D-SUB
ECR
¬¾¾®
2
ECR ER-02FD
·
Cable: 9 pin D-SUB – 25 pin D-SUB
ECR
2. SIO interface specification
1) Operation: Simplex
2) Line configuration: Direct connect
3) Data rate: 19200, 9600, 4800, 2400, 1200, 600, 300BPS
(Selected by SRV JOB#903-A)
4) Sync mode: Asynchronous
5) Checking: Vertical parity (odd)
6) Code: 7 bits (ASCII)
7) Bit sequence: LSB first
8) Line level: RS232 level
9) Data forma:
LSB
b1 b2 b3
Start bit
ECR
Fig. 1-1
ER-02FD
Fig. 1-2
MSB
b4 b5 b6 b7 P
Parity
Stop
bit
bit
FIg. 2-1
3. Location of connector pins
1
ECR-ECR cable
9PIN D-SUB
ECR
SD 3
RD 2
7
RTS
1
DCD
DTR 4
DSR
6
CTS 8
SG 5
SD : TRANSMITTED DATA
RD : RECEIVED DATA
DTR: DATA TERMINAL READY
DSR: DATA SET READY
RTS: REQUEST TO SEND
DCD: DATA CARRIER DETECTOR
CTS: CLEAR TO SEND
6 – 1
9PIN D-SUB
ECR
3
SD
2
RD
7
RTS
1
DCD
4 DTR
DSR
6
8 CTS
5 SG
Fig. 3-1