E C O P H Y S I C S RS-232 interface
CLD 780 TR / July 2000 105
b) Data format definitions
Data are transferred in ASCII format. If more than one data character is
required, they are separated by commas. The field length of a data item is
fixed. Numeric characters are right justified. Spaces or zeros must be
placed as leading characters. Refer to the command set.
Definitions:
“S“ means ASCII S (hex 53)
“ “ means ASCII SP
control character (hex 20)
<STX> means ASCII STX
control character (hex 2)
Example:
1. Set measuring range of instrument 12 to 100 ppb:
<STX> “1“ “2“ “S“ “R“ “1“ <ETX> <BCC>
2. Set analog output of instrument 3 to 0...10 V full-scale, 20 % offset
operation:
<STX> “0“ “3“ “S“ “A“ “1“ “ ,“ “1“ “ ,“ “0“ <ETX> <BCC>
Error code definitions
The CLD 780 TR will respond to the host with an “NAK“ message if any of
the following conditions occur:
Block check error:
The received BCC did not correspond to the received data.
Command overflow:
The CLD 780 TR did not receive the ETX and BCC of a command and sub-
sequently received a valid new command.
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