A-1
Appendix A. SDI-12 Interface
If you are not familiar with the SDI-12 protocol, you can visit the following
web page and learn more about it:
http://www.sdi-12.org/sdi-12/table_of_contents.htm
A.1 SDI-12 Modes
The Vosponder is capable of emulating either an SDI-12 master unit or an
SDI-12 slave unit. The master mode is best used when the Vosponder is being
used with any SDI-12 compatible sensor or any SDI-12 device that cannot
issue SDI-12 extended commands. The slave mode allows the Vosponder to
be controlled by a datalogger, receiving data from the datalogger and then
verbalizing it upon command.
A.2 SDI-12 Slave Mode Commands
The Vosponder responds to a subset of the commands specified in the SDI-12
protocol. They are:
Command
Name
ASCII Codes
Response
Vosponder Action
Address Query
?!
Address
None
Acknowledge
Active
a!
Address
None
Send
Identification
aI!
Address, ID
String
None
Change Address
aAb!
New Address
None
Start
Measurement
aM!
Address, 0011
None, SDI
Compliance Only
Retrieve Data
aDx!
Address, First
Data Location
of Last
Received Burst
None, SDI
Compliance Only
Verify
aV!
Address, 0011
None, SDI
Compliance Only
Send Data
aXDnnnnnnnn
~!
Address
Stores New Data
Speak Data Now
aXS!
Address
Speaks Image w/Last
Data
Speak Alarm
aXA!
Address
Speaks Alarm String
Speak Text
aXTxxxxxxxx!
Address
Speaks Included Text
String
FIGURE A-1. SDI-12 Slave Mode Commands
Where a = the Vosponder SDI-12 Address, b = the New address, nnnnnn = the
input locations reporting, and xxxxxx = a text string.
Содержание Vospoder
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