Sea-Bird Electronics SBE 38 User Manual download pdf (Page 27)

Appendix III: RS-485 Interface

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 computer 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: 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 IDReq=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 AutoRun=Y (sample continuously when power is applied), set NAvg=

(A/D cycles to average per sample) to a value greater than 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:

¾ t = temperature (°C, ITS-90)

(number of digits to right of decimal point is defined by Digits=)

¾ ii = ID (0 – 99)

¾ 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).

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Sea-Bird Electronics SBE 38 User Manual Page 27

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