ER-A450S (serv.man5). Service Manual - Sharp ECR Service Manual (repair manual). Page 39

ECR-ER-02FD cable

Fig. 3-2

The following service (SRV) modes are available for the serial data
transfer of the ECR

1) Data transmit (Source side)

X: 0=SSP DATA

2) Data receive (Target)

A single byte image of the RAM data to be transmitted is divided into
a high order 4 bits and low order 4 bits and converted into ASCII
code. Then, the image of the memory is sent in the following format:

Memory top address: 0000H 

∼

 FFFFH

Top address of the memory to be transmitted in ASCII number.

Page:1F 

∼

 27,00

Page of the memory to be transmitted in ASCII number.

Sum check

End code: Hex  0D

NOTE:

•

In order that contents of RAM memory may not over-ride pages for
this job, RAM image is sent in unit of 64 bytes from the address
0000. In other words, 128 bytes are sent at one time on the
transmit data format.

RAM DATA FORMAT

Exhibit:

Code table

HEX

ASCII

Character

HEX

ASCII

Character

0

30

0

8

38

8

1

31

1

9

39

9

2

32

2

A

41

A

3

33

3

B

42

B

4

34

4

C

43

C

5

35

5

D

44

D

6

36

6

E

45

E

7

37

7

F

46

F

End message:

Fixed to 30303030.

End massage:

Fixed to 4646.

Sum check

End code:

CR (0D)

SD

2

SD

RD

CTS

RD

3

6

5

3

2

6

8

ER-02FD

7

5

SG

RTS

4

DCD

8

DTR

20

DSR

7

1

4

ECR

CTS

SG

RTS

DCD

DTR

DSR

1

FG

FRAME GROUND is connected
to the shield of the cable.

25PIN D-SUB

9PIN D-SUB

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
FG  : FRAME GROUND

996

X

TL

All data

X

ST

(Auto baud rate setting: ECR to ECR only)

(Baud rate setting: #903-A)

998

X

TL

(Auto baud rate setting: ECR to ECR only)

(Baud rate setting: #903-A)

ST

1

2

3

4

Data (128bytes)

BD

7E

83

FC

03

B6

42 44 37 45 38 33 46 43 30 33 42 36

30

3

4

30

30

30

1

2

6 – 2