
ZENO
®
-3200 USER MANUAL
Coastal Environmental Systems (206) 682-6048
Page 64
The ZENO
®
-3200 only responds to a validated CCSAIL message. The
response is in the form of another CCSAIL message.
The following table shows what steps a ZENO
®
-3200 performs when it receives a potentially valid
CCSAIL message.
Step Action ZENO
®
-3200 Carries Out
1
A # character is identified by the ZENO
®
-3200 indicating the possible start of
a CCSAIL message.
2
The ZENO
®
-3200 waits until it receives the <ETX> End Character of the
CCSAIL message. Once received, it moves on to Step #3; otherwise, it no
further action is taken until Step #1 is repeated.
3
The ZENO
®
-3200 calculates a checksum of all but the last 3 characters of the
received message. It compares the modulo-100 checksum with the characters
stored in the Checksum Field of the received message. If the checksums
match, the ZENO
®
-3200 moves on to Step #4; otherwise, no further action is
taken until Step #1 is repeated.
4
The Destination Address of the received message is compared to the ZENO
®
-
3200's Primary Unit ID, if the addresses match or the received Destination
Address is 9999, The ZENO
®
-3200 has received a valid CCSAIL message
and moves on to Step #5; otherwise no further action is taken until Step #1 is
repeated.
5
The ZENO
®
-3200 examines the "message" portion of the validated message.
If it identifies the command, it carries out the command and responds with the
appropriate information within another CCSAIL message.. If it can neither
identify nor carry out the command, it responds with a CCSAIL "NACK" or
CCSAIL "ERROR" message.
When the ZENO
®
-3200 transmits a response to a received CCSAIL message,
the Source Address of the received message becomes the Destination
Address of the transmitted response.
4.6.3. CCSAIL Data Retrieval Commands
The CCSAIL data retrieval commands match those available in the Data Retrieval Menu. The available
CCSAIL data retrieval commands are listed in Appendix E
Let's say that you want to retrieve the five (5) most recently stored Data Records from a ZENO
®
-3200
whose Primary Unit ID is set to 1025 and your location is referred to as 100.
You would create the CCSAIL command that would retrieve these Data Records as follows:
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