Xylem 4015 User Manual

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.