Sea-Bird Electronics SBE 38, User Manual

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Manual revision 013 Appendix III: RS-485 Interface SBE 38
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ID Commands
Only one SBE 38 can be online when sending these commands.
ID? Display SBE 38 ID (ID = ii, where ii= 0-99) and
whether ID is required as a prefix for commands to
individual SBE 38s (see IDReq= ).
*ID=ii Set SBE 38 ID to ii, where ii= 0-99. * ID= must be
sent twice, because the SBE 38 requests
verification. If more than one RS-485 instrument
is online when sending this command, all
instruments online will be set to same ID .
All Other Commands
All other commands (status, setup, sampling, and coefficients) are listed
in Section 4: Deploying and Operating RS-232 SBE 38 and in
Appendix IV: RS-232 Command Summary .
Notes on use of these commands for an SBE 38 with RS-485 interface:
• Effect of
IDReq=
:
If
IDReq=Y
, precede these commands with
#ii
(ii = 0 – 99) to direct a
command to a particular SBE 38.
If #iiIDReq=N , do not precede these commands with #ii . This setting
works only for a system with one SBE 38.
• The RS-485 interface cannot accommodate multiple instruments
transmitting real-time data at the same time. Therefore, do not set
AutoRun=Y
(start sampling continuously when power is applied) for a
system with more than one RS-485 instrument on a pair of wires.
Similarly, do not attempt to send Go to multiple SBE 38s on a pair of
wires, as the system cannot transmit a command to one instrument while
another instrument is transmitting real-time data.
• If planning to sample continuously: If AutoRun=Y (sample
continuously when power is applied) or using the Go command to start
sampling continuously,
set NAvg= (A/D cycles to average per sample)
to a value greater than or equal to 30.
Data Formats
Converted Data (Format=C)
Output from continuous sampling:
ttt.ttt
Output from
DATAii
,
#iiTS
,
TS
,
#iiSH
,
SH
,
#iiSL
,
SL
,
#iiSLT
, or
SLT
:
ii, sssss, ttt.ttt
where :

t = temperature (°C, ITS-90)
(number of digits to right of decimal point is defined by Digits= )

ii = ID (0 – 99)

sssss = SBE 38 serial number
Raw Data (Format=R)
nnnnnn.n
where:

n = counts
Notes:
• Each line of output is followed by
a carriage return and line feed.
• For converted data, leading zeros
for temperature output are
suppressed, except for one zero
to the left of the decimal point
(for example, 0.1034).
Note:
IDReq=Y does not require a #ii prefix.
IDReq=N does require a #ii prefix
( #iiIDReq=N ).
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