Ecotech Acoem Serinus 30 - C.2 Commands

Appendix
Page 219
Note: The I.D. of 97 is sent as the sequence 097. All I.D. strings must have three digits and must
always be padded with ASCII zero characters.
This is an example of a valid command to put the unit in the manual span mode if the instrument has
an ID of 843:
<STX>ST843 K<ETX>52
The block check operation is best shown with the following table:
Table 35 – Block Check Operation
Character
Hex Value
Binary
Block Check
<STX>
02
0000 0010
0000 0010
S
53
0101 0011
0101 0001
T
54
0101 0100
0000 0101
8
38
0011 1000
0011 1101
4
34
0011 0100
0000 1001
3
33
0011 0011
0011 1010
<SPACE>
20
0010 0000
0001 1010
K
4B
0100 1011
0101 0001
<ETX>
03
0000 0011
0101 0010
The binary block check value is 0101 0010 which is the hex value 52 as shown at the end of the
command string.
C.2 Commands
DA
Return the current instantaneous concentration.
Command Format
<STX>{DA}{<kkk>}<ETX>< bcc1><bcc2>
Where:
kkk Device’s ID. This field is optional, but if provided it must be padded with
zeros to be 3 characters long. The value must match one of the
following: the instrument’s Bayern-Hessen ID, 000, or ??? (three
question marks).
bcc1 First byte of the block check calculation.
bcc2 Second byte of the block check calculation.