Sharp ER-A450T Service Manual - Page 39

ECR-ER-02FD cable 25PIN D-SUB ER-02FD SD 2 9PIN D-SUB ECR 3 SD RD 3 RTS 4 DCD 8 2 RD 7 RTS 1 DCD DTR 20 4 DTR DSR 6 6 DSR CTS 5 8 CTS SG 7 5 SG FG 1 FRAME GROUND is connected to the shield of the cable. 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) All data 996 @/FOR X CA/AT (Baud rate setting: #903-A) SBTL (Auto baud rate setting: ECR to ECR only) X: 0=SSP DATA 2) Data receive (Target) 998 @/FOR CA/AT (Baud rate setting: #903-A) SBTL (Auto baud rate setting: ECR to ECR only) 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 Data (128bytes) 34 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 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 03 B6 42 44 37 45 38 33 46 43 30 33 42 36 Code table HEX 0 1 2 3 4 5 6 7 ASCII 30 31 32 33 34 35 36 37 Character 0 1 2 3 4 5 6 7 HEX 8 9 A B C D E F ASCII 38 39 41 42 43 44 45 46 Character 8 9 A B C D E F 6. END record 30 30 30 30 2 34 1 End message: Fixed to 30303030. End massage: Fixed to 4646. Sum check End code: CR (0D) 6 - 2