Xylem H-3531 FlashLite - Manual (Page 55)

H-3531
SDI-12 Command and Response Protocol 5-17
5.16 Extended Read/Write 4-20mA_Hi and Read/Write 4-20mA_Lo
The H-3531 FlashLite™ scales the current Stage data to drive the 4-20mA output. The 4-
20mA_Hi and 4-20mA_Lo settings control how the Stage data is processed. The 4-20mA_Lo
should be set to the desired Stage corresponding to a 4.00mA output. The 4-20mA_Hi should be
set to the desired Stage corresponding to a 20.00mA output. These settings are stored in non-
volatile EEPROM within the sensor. Once the new value is written to the EEPROM, a copy is
sent to the sensor data buffer for verification. This data can be viewed by using a subsequent
"aD0" command. To verify these settings any other time, use the “XRIH" or “XRIL” commands.
The H-3531 FlashLite™ comes from the factory with the 4-20mA_Hi = 34.6 feet and 4-20mA_Lo
= 0.0 feet.(0-15 psi sensor range)
Command Response Description
"aXRIH!" “a0011" Read 4-20mA_Hi
"aXRIL!" “a0011" Read 4-20mA_Lo
"aXWIHddd!" “a0061" Write 4-20mA_Hi
"aXWILddd!" “a0061" Write 4-20mA_Lo
Where: a is the sensor address ("0-9", "A-Z", "a-z", "*", "?").
XRIH are upper case characters.
XRIL are upper case characters.
XWIH are upper case characters.
XWIL are upper case characters.
ddd is the new value.
This command takes 001 seconds to complete and places 1 value in the data buffer. Use the
“aD0" command to collect and view the slope or offset.
Example of a H-3531 Extended "Read 4-20mA_Hi" command:
Command
Response Time Values Description
"aXRIH!" "a0011" 1 sec 1 Read 4-20mA_Hi
Command Response Description
"aD0!" "a+34.60" 4-20mA_Hi is 34.60
Example of a H-3531 Extended "Write 4-20mA_Hi" command:
Command
Response Time Values Description
"aXWIH34.6!" "a0061" 6 sec 1 Write 4-20mA_Hi and make
new measurement
Command Response Description
"aD0!" "a+34.6" 4-20mA_Hi is 34.6