Sharp ER-A440 Service Manual page 31

ECR-ER-02FD cable
25PIN D-SUB
ER-02FD
SD 2
3
RD
4
RTS
8
DCD
DTR 20
DSR 6
CTS 5
SG 7
FG 1
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
4. Application specification
The following service (SRV) modes are available for the serial data
transfer of the ECR
1) Data transmit (Source side)
X
996
(Auto baud rate setting: ECR to ECR only)
X: 0=SSP DATA
2) Data receive (Target)
998 X
(Baud rate setting: #903-A)
(Auto baud rate setting: ECR to ECR only)
9PIN D-SUB
ECR
3
2
7
RTS
1
DCD
4 DTR
6 DSR
8 CTS
5
FRAME GROUND is connected
to the shield of the cable.
Fig. 3-2
All data
X
CA/AT
(Baud rate setting: #903-A)
SBTL
CA/AT
SBTL
5. Data format
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:
SD
1
RD
Memory top address: 0000H
Top address of the memory to be transmitted in ASCII number.
Page:1F
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:
BD
SG
42 44 37 45 38 33 46 43 30 33 42 36
Code table
HEX
0
1
2
3
4
5
6
7
6. END record
30
End message:
End massage:
Sum check
End code:
6 – 2
2
Data (128bytes)
FFFFH
27,00
7E 83 FC 03 B6
ASCII Character HEX
30 0 8
31 1 9
32 2 A
33 3 B
34 4 C
35 5 D
36 6 E
37 7 F
30 30 30
2 3 4
1
Fixed to 30303030.
Fixed to 4646.
CR (0D)
3 4
ASCII Character
38 8
39 9
41 A
42 B
43 C
44 D
45 E
46 F