MyWeigh HD SERIES - Manual (Page 4)

Data bits : 8 bits
Stop bit : 1 bit
Parity : none
When work mode “SCI.3” is selected and the scales “DATA” key is pressed or the carriage return
(0d hex) is received, the HD shipping scale will transmit the appropriate weight, unit, stability,
over/down or low voltage message through computers serial port continuously.
Baud rate : 9600bps
Start bit : 1 bit
Data bits : 8 bits
Stop bit : 1 bit
Parity : none
(2) The scale transmits 14 bytes ASCII data each time:
The details are as follows:
Byte1. “:” (colon), starting byte
Byte2. “W” the following 7 bytes (3 through 9) are weight;
“M” the following 7 bytes (3 through 9) are messages
Byte3. “- “ Byte 4 through Byte 9 are negative weight;
“ ” Byte 4 through Byte 9 are positive weight or other message
Byte4. Current weight or other message
Byte5. Current weight or other message
Byte6. Current weight or other message
Byte7. Current weight or other message
Byte8. Current weight or other message
Byte9. Current weight or other message
Byte10.11. “lb” the weight unit is lb;
“kg” the weight unit is kg
Byte12. “S” the readings are stable;
“ ” the readings are unstable
Byte13. “L” low voltage
“ ” normal voltage
Byte14. Carriage Return (0d hex)
(3) RS-232 connect between HD scale and Host :
Scale--------------------------Cable-----------------------Host
(DB9 female)-----------(DB9 male)-(DB9 female)-------(DB9 male)
TXD 2----------------2------------------2-------------2 RXD
RXD 3----------------3------------------3-------------3 TXD
GND 5----------------5------------------5-------------5 GND
DSR 4----------------4------------------4-------------4 DTR
DTR 6----------------6------------------6-------------6 DSR
CTS 7----------------7------------------7-------------7 RTS
RTS 8----------------8------------------8-------------8 CTS
NC 1----------------1------------------1-------------1
NC 9----------------9------------------9-------------9
***Note: HD scale DB9 female’s pin4 and pin6 is shorted, pin7 and pin8 is shorted!