Xylem System 5000 User Manual - Manual (Page 74)

The next three bytes are the channel number. In this case 021 is channel 21. This is an odd
number which normally indicates it is transmitting to the eastern satellite (75 Degrees W). Even
channel numbers normally transmit to the western satellite (135 Degrees W).
163708DE08078184903G51+1NN021EUB00023BCT@DZ@DY@Dc@Db@Dm@Dxj
The next byte is a letter E or W indicating the eastern or western satellite. In this case the eastern
satellite received the transmission.
163708DE08078184903G51+1NN021eUB00023BCT@DZ@DY@Dc@Db@Dm@Dxj
The next two bytes are currently unused (TBD).
163708DE08078184903G51+1NN021EuB00023BCT@DZ@DY@Dc@Db@Dm@Dxj
The next few bytes indicate how many data bytes are in the transmission. In this case 00023 data
bytes were expected.
163708DE08078184903G51+1NN021EUB00023BCT@DZ@DY@Dc@Db@Dm@Dxj
This is the end of the header information added by the GOES system. Everything from this point
on is from the data logger and is normally data. The data could be decoded using the above
methods in the Understanding Binary Data section.
Also in this case it is easy to see this is a 100 baud transmission. This is because the data starts
immediately after the data byte count. A 300 or 1200 baud transmission will have one extra byte
after the byte count and before the start of data. This extra byte will always be one of four
possibilities, indicating the type of data and whether the unit successfully updated its time from a
GPS system since the last transmission. The possibilities are listed below.
OUTPUTS
72
Character Comment
Space ASCII Data, No time sync occurred since the
last transmission
Double Quote “ ASCII Data, Time sync occurred since the last
transmission
Single Quote ‘ Binary Data, No time sync occurred since the
last transmission
Lower Case b Binary Data, Time sync occurred since the
last transmission