Sharp ER-A450T Service Manual page 39

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