Xylem H-3553 - Manual (Page 15)

Setup & Operation
13
setting Default setting
Baud Rate 9600
Data Bits 8
Stop Bits 1
Parity None
Duplex Full
Emulation VT-100
Flow Control None
SDI-12 Interface
The SDI-12 interface is another way to setup and operate the H-3553. The H-3553 supports all standard
SDI-12 commands and uses some SDI-12 extended (manufacturer specific) commands for setup operation.
SDI-12 standard and extended commands are normally sent from a SDI-12 master device, like the Waterlog
XL series DCP. Table 4-2 is a list of the standard SDI-12 commands and the extended SDI-12 commands for
setting up the H-3553.
Command Description Command Description
Standard SDI-12 Commands
a! Acknowledge aM2! Initiate Purge
al! Identify aC!-aC9! Concurrent Measure
aV! Verify aCC!-aCC9! Concurrent measure w/CRC
aM!-aM1! Measure aD0!-aD9! Data Retrieval
aMC!-MC1! Measure with CRC aAn! Change Address
Extended SDI-12 Commands
aXSDEF! Reset to Defaults aXRPP! Read Purge Pressure
aXWSn.nn! Write Stage Slope aXWPSnn! Write Purge Sustain
aXRS! Read Stage Slope aXRPS! Read Purge Sustain
aXSCSn.nn! Set Current Stage aXWIHn.nn! Write 4-20mA Stage max
aXWOn.nn! Write Stage Offset aXRIH! Read 4-20mA Stage Max
aXRO! Read Stage Offset aXWILn.nn! Write 4-20mA Stage Min
aXWATnn! Write Averaging Time aXRIL! Read 4-20mA Stage Min
aXRAT! Read Averaging Time aXWMEn! Write Modbus enable
aXWSDn! Write RS-232 Stage Digits aXRMEn! Read Modbus enable
aXRSD! Read RS-232 Stage Digits aXWAEn! Write Auto enable
aXWBRnn! Write Bubble Rate aXRAEn! Read Auto enable
aXRBR! Read Bubble Rate aXWMRnn! Write Measure Rate
aXWPPnn! Write Purge Pressure aXRMR! Read Measure Rate
aXTD! Test Display aXHELP! Display a List of Commands
Table 4-2: H-3553 Standard and Extended SDI-12 Commands
Note, the ‘a’ character in Table 4-2 represents the current SDI-12 address of the H-3553 and the ‘n’ characters
represent the new value to be written. Each H-3553 extended SDI-12 command is discussed in more detail
later in the chapter.