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DigiTemp User Manual Chapter 2 SDI Commands
page 9
2.1 Notation for SDI commands
In the end, SDI commands are strings of characters sent to the SDI device. The format of those strings is
important, of course, and to specify the format of SDI commands we use different typefaces. All commands
(and the replies from the device) are represented in a monospaced font,
thus . Different parts of a command
are represented with variants on this text format.
Item Meaning Text representation
Command literal Part of a command that must be
reproduced literally as it appears;
X
Command
parameter
Part of a command that must be filled in
with an appropriate value
data
2.2 Commands recognized by DigiTemp
The table below provides a quick reference to the commands recognized by the DigiTemp. For details on these
commands, see the following sections.
Command name Command code Notes
Address Query ?!
Acknowledge Active a !
Change Address a A b !
Send Identification a I!
Start Measurement a M! , a MC! C following a command requests a CRC code
in the data return ( D command)
Start Concurrent Measurement
a C!
,
a CC! C
following a command requests a CRC code
in the data return ( D command)
Send Data a D b !
Continuous Measurements (Read) a R! , a RC! C following a command requests a CRC code
in the data return
Start Verification a V!
2.3 General SDI commands
General SDI commands are used for housekeeping issues such as device address configuration, device
identification and confirmation of device communications. General SDI-12 version 1.3 commands are as
follows.