Model 4015 SDI-12 to Analog Converter
Instruction Manual 60-0004015-00
1.0 INTRODUCTION
1.1 General description:
The Model 4015 is used as an interface between an SDI-12 serial communications
bus and an analog measurement system. The converter can either act as a SDI-12
master by polling a sensor on a timed basis or “listen only” as an external
recorder polls the sensor. Each 4015 responds to a single SDI-12 address and
parameter. Multiple 4015 converters can be used to translate several sensor
parameters to individual analog outputs. The output of the converter is
proportional to the “value” of the sensor response. Full scale and zero values can
be programmed by the user to scale the analog output with respect to the raw
sensor value.
The 4015 can be configured to provide a 0-1mA , 0-20mA , or 4-20mA current
output with 0-5 volt output always available. The connection to the data
transmitter or measurement system consists of continuous power (10 to 33VDC),
ground, and a switched read voltage (5 to 33VDC) that enables the analog
output. With the read terminal energized, power consumption increases to the
sum of the current output (20mA max) and an additional 4 mA (max). With the
read terminal de-energized, current drops to less than 500 uA.
All user programming is done over the SDI-12 bus.
Specifications:
1.2
Size: 3.5”L X 0.75”W X 2.1”H
Weight: 1.9 oz.
Operating Temperatures: -30 to 60 degrees Centigrade
Power requirements: 10 to 33 VDC
8mA + Output current (max) during read.
Mounting: DIN rail (35mm)
Connections: Screw Terminal
Wire Size: #24 - #14 AWG
Communication: SDI-12 (version 1.1 compliant)
Output Resolution 12 bits
Accuracy better than 0.1%
2.0 OPERATION
Programming of the 4015 is performed over the SDI-12 connection. If the data
collection platform (master) for your system does not provide a “transparent”
communications mode, connection can be provided using a Model 4021 SDI-12
to RS232 adaptor. The default device address for the 4015 is H (upper case).
The 4015 will poll the sensor (even in the listen only mode) when the “Poll”
button is pressed.
2.1 CONNECTIONS
4015 SDI-12 Commands
The 4015 responds to all basic SDI commands. The 4015 is set at the factory for SDI-12
address H. This address is for extended commands and can be changed to any address
except that being used for the sensor address. All command and response characters are
in ASCII format, 1200 baud, even parity. Refer to www.sdi-12.org for complete SDI-12
specifications.
The 4015 will adjust its output when the specified sensor address and parameter is
detected on the SDI-12 bus. If the desired parameter is not found, the 4015 will not
update the output. In the event that the output is set to 4-20mA and the 4-20Alarm is
enabled, the output will drop to zero mA when the desired parameter is not found.
The small ‘a’ denotes the device address.
Command
Response
Acknowledge Active: Returns a response
acknowledging that the sensor unit is active.
Send Identification: Returns SDI version,
company name, sensor model #, sensor version #.
Address Query: Returns the address for sensor.
Only one sensor may be on the buss for this query
Change Address: Changes the address of the
sensor unit.
EXTENDED COMMANDS (Unique to 4015) Read Settings Status aXSTAT! Reads back all settings
Set Sensor Address to be monitored (or polled)
by 4015
Set Sensor Parameter to be monitored (or polled)
by 4015
Set Polling Time (seconds) or
(zero seconds = Listen Only)
Set Zero Value Value to create zero output
level. nnn.dd is a floating point number.
Set Full Scale Value Value to create full scale
output level.
nnn.dd is a floating point number.
Set Output Format
Enable 4-20mA Alarm In 4-20mA mode, current
drops to 0mA if parameter is not found.
Disable 4-20mA Alarm No change in output is
Parameter is not found.
Set Output Value (0 to 4095) aXVALUnnnn! a DAC Value = nnnn Read Sensor Now Causes 4015 to poll sensor
aXZEROnnn.dd
aXFULLnnn.dd! a Full Scale = nnn.dd
a! a
aI! a10highsierra_4015_00v_date_
?! a
aAb! b
b is the new sensor address.
Command
aXADDRx! a SDI address = x
aXPARAn! a Parameter = n
aXTIMEssss! a Poll Time = ssss (Listen
a Zero = nnn.dd
!
aXOUT4-20!
aXOUT0-20!
aXOUT0-1!
aXALON! a 4-20 Alarm On
aXALOF! a 4-20 Alarm Off
aXREAD!
Response
Only)
a 4-20mA
a 0-20mA
a 0-1mA
3.0 RETURNS
Call us for tech support: 800-876-1172 or 916-638-3429 (many problems can
be solved over the phone). Fax: 916-638-3270 or Email:
globalw@globalw.com.
Be prepared to describe the problem being experienced including specific
details of the application and installation and any additional pertinent
information.
In the event that the equipment needs to be returned to the factory for any
reason, please call to obtain a RMA # (Return Material Authorization). Do not
return items without a RMA # displayed on the outside of the package.
Include a written statement describing the problems.
Send the package with shipping prepaid to our factory address. Insure the
shipment, as the warranty does not cover damage incurred during transit.
When calling for tech support, please have the following information ready;
1. Model #.
2. Unit serial number.
3. P.O.# the equipment was purchased on.
4. Global Water’s sales number or the invoice number.
5. Repair instructions and/or specific problems relating to the product.
4.0 WARRANTY
Global Water Instrumentation, Inc. warrants that its products are free from
defects in material and workmanship under normal use and service for a
period of one year from date of shipment from factory. Global Water’s
obligations under this warranty are limited to, at Global Water’s option: (I)
replacing or (II) repairing; any products determined to be defective. In no
case shall Global Water’s liability exceed the products original purchase price.
This warranty does not apply to any equipment that has been repaired or
altered, except by Global Water Instrumentation, Inc., or which has been
subject to misuse, negligence or accident. It is expressly agreed that this
warranty will be in lieu of all warranties of fitness and in lieu of the warranty of
merchantability.
The warranty begins on the date of the product’s invoice.
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