Salter Brecknell WB-521 Series - Manual (Page 67)

SBI521 Service Manual 65
The data frame format from COM2 is:
<CR><LF><STX><STH><STL><W1H><W1L><W2H><W2L><W3H><W3L><ETX>
Total 12 bytes are in a frame string. W1W2W3 is 24bits output raw counts from ADC
(Hex format), (ST) is status byte, <XXH>is its high order 4 bits of XX and <XXL> is its
lower order 4bits of XX
Status byte definition:
When Indicator is going to power off, it outputs following content to COM2:
<STX> "OFF"<ETX><CR><LF>
6.5.4 Communication when USER-COM1/2-LAYOUT is set to 200S/200F:
Commands and response
Command:
W <CR>(57h 0dh) or P<CR> (50h 0dh), request current reading
Response:
The indicator will not respond if the scale is in motion, positive overload or negative
overload.
Figure 6.1 Set for 200S
Bit STH Bit STL
4 0= in working
1=be going to power off
0 0= AD is not over
1=AD is ove
5 X 1 0= no AD error
1= AD error
6 0 2 0=not new data
1=new data
7 0 3 0=voltage is not low
1=voltage is low