Sutron AnalogPlus SDI-12 6661-1248-1 Manual

SDI-12 ANALOG PLUS
MODEL6661-1248-1
OPERATIONS&
MAINTENANCEMANUAL
Part No. 8800-1145
Revision - D
15-Oct-2010
Sutron Corporation
22400 Davis Drive
Sterling, Virginia 20164
TEL: [phone]
http://www.sutron.com/

Bringing the Benefits of Real-Time Data Collection to the World
Sutron Corporation, Tel: [phone] http://www.sutron.com
Table of Contents
1. Introduction..........................................................................................................................1
Features....................................................................................................................................1
2. Quick Start............................................................................................................................2
3. SDI-12 Commands (Overview) ...........................................................................................4
Setting the Address...................................................................................................................4
Verifying the Address and Operation.......................................................................................5
Making a Measurement............................................................................................................6
Selecting a measurement command class...................................................................6
Always supported ........................................................................................6
Multiple long measurement time sensors.....................................................6
Improved data integrity checking ................................................................6
Example: (M command) ............................................................................................6
C, MC and CC commands..........................................................................................7
Other Measurements ..................................................................................................7
Factory Programmed Default Measurements ...........................................................................7
M, C, MC, CC .............................................................................................7
M1, C1, MC1, CC1 .....................................................................................8
M2, C2, MC2, CC2 .....................................................................................8
M3, C3, MC3, CC3 .....................................................................................8
M4, C4, MC4, CC4 .....................................................................................8
M5, C5, MC5, CC5 .....................................................................................8
M6, C6, MC6, CC6 .....................................................................................8
M7, C7, MC7, CC7 .....................................................................................8
M8, C8, MC8, CC8 .....................................................................................8
M9, C9, MC9, CC9 .....................................................................................8
4. Measurements......................................................................................................................9
Setting a Measurement (Quick Set-up With Default Parameters) ............................................9
Voltage Measurement (Single-ended)........................................................................9
Voltage Measurement (Differential) ..........................................................................9
Ratiometric Measurement..........................................................................................9
Tipping-Bucket Measurement....................................................................................10
Counts Measurement..................................................................................................10
Frequency Measurement............................................................................................10
Period Measurement ..................................................................................................10
Quadrature Shaft Encoder Measurement ...................................................................11
Notes on Handar 436 Quadrature Ecoder (any switch closure output encoders) .......11
State of Port ...............................................................................................................12
Setting a Measurement (Specific Set-up With User-Defined Parameters) ...............................13
Voltage Measurement ................................................................................................13
SDI-12 set-up command..............................................................................13
Examples .....................................................................................................14
Verification and Reading current Set-up......................................................14
Ratiometric Measurement..........................................................................................15
SDI-12 set-up command..............................................................................15
Examples .....................................................................................................16
Verification and Reading current Set-up......................................................16
Tipping-Bucket Measurement....................................................................................17
SDI-12 set-up command.............................................................................17

ii
Examples .....................................................................................................17
Verification and Reading current Set-up......................................................18
Count Measurement...................................................................................................18
SDI-12 set-up command..............................................................................18
Examples .....................................................................................................18
Verification and Reading current Set-up......................................................19
Frequency Measurement............................................................................................19
SDI-12 set-up command.............................................................................19
Examples .....................................................................................................19
Verification and Reading current Set-up......................................................20
Period Measurement ..................................................................................................20
SDI-12 set-up command..............................................................................20
Examples .....................................................................................................20
Verification and Reading current Set-up......................................................21
Quadrature Shaft Encoder Measurement ...................................................................21
Offset...........................................................................................................22
Scale-Factor.................................................................................................22
Direction of Rotation...................................................................................22
Average, Minimum and Maximum Value/Measurement-time.....................23
Status Byte...................................................................................................23
Verification and Reading current Set-up......................................................23
State of Port ...............................................................................................................23
Example.......................................................................................................23
Switched Voltage SW‟D ..........................................................................................................24
Resetting to a Factory Default Configuration...........................................................................24
5. Measurement Configuration Recommendations.................................................................25
Analog measurement Parameters .............................................................................................25
Channel, Gain, Buffering...........................................................................................25
Averaging / Filtering..................................................................................................25
Vref warm-up time.....................................................................................................26
Switched voltage and Switched voltage warm-up time..............................................26
Example Setup Tutorials..........................................................................................................26
AT/RH Probe.............................................................................................................26
Continuously Powered.................................................................................26
Powered for measurements only..................................................................27
Air Temperature Sensor.............................................................................................27
4-20mA Output Sensor ..............................................................................................28
6. Troubleshooting and Maintenance......................................................................................29
Troubleshooting .......................................................................................................................29
Maintenance.............................................................................................................................29
7. Specifications for SDI-12 AnalogPlus module.....................................................................30
APPENDIX A -- Command Reference .....................................................................................31
APPENDIX B -- SDI-12 with the Sutron 8200, 8200A, and 8210.............................................37
Entering Extended Commands for Configuration Purposes.....................................................37
From the Front Panel..................................................................................................37
From a PC connected to the RS-232 port...................................................................37
Logging data from the M1 or M2 commands or from addresses above 9 ................................37
Logging data with multiple data recorders ...............................................................................38
Setup two Sutron data recorders with one SDI-12 AnalogPlus module.....................38
Setup two Sutron Data Recorders with two SDI-12 AnalogPlus modules.................38

Bringing the Benefits of Real-Time Data Collection to the World
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APPENDIX C -- Dimensions.....................................................................................................39
APPENDIX D -- Sutron Customer Service Policy.....................................................................40
APPENDIX E -- Commercial Warranty.....................................................................................41
SUTRON MANUFACTURED EQUIPMENT........................................................................41
NON-SUTRON MANUFACTURED EQUIPMENT..............................................................41
REPAIR AND RETURN POLICY..........................................................................................41
EXTENDED WARRANTY AND ON-SITE MAINTENANCE.............................................41

Bringing the Benefits of Real-Time Data Collection to the World
Sutron Corporation, Tel: [phone] http://www.sutron.com
1. Introduction
The SDI-12 AnalogPlus module has 5 ports to take measurements from vast variety of sensors and transfer
the results to a data recorder. Three of them (AN1, AN2, AN3) are exclusively for analog measurements, one
(DIN) is exclusively for digital measurements, and AN4 can be used for analog as well as logic level driven
digital measurements.
Features
High accuracy & excellent stability
Four Analog inputs with
oCan be configured for Single-ended or Differential voltage measurements
oReference voltage output for ratiometric sensors (bridges and potentiometers)
o24-bit A/D converter
o0-5V input range
oProgrammable gain (1 to 128) user specified or Automatic gain
oSimultaneous 50Hz and 60Hz noise rejection.
One digital input with selectable pull-up (or pull-down) to support switch closure type inputs.
Additional digital input for 0-5 V signals (shared with Analog channel 4).
Frequency measurement : 1 Hz to 8 kHz
Counts measurement
Quadrature Shaft Encoder measurement
Programmable switch de-bounce times to prevent multiple counts on a single event.
Programmable switched 5 volts and 12 volts output
Low power consumption : < 0.5 mA in standby mode
Programmable coefficients for conversion to engineering units such as degrees C.
Supports SDI-12 version 1.3
Configurable measurement commands.
Non-volatile setup
DIN rail mountable with a real spring on the metal clip
Pluggable terminal blocks

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2. Quick Start
The SDI-12 AnalogPlus module arrives ready to use for many voltage measuring applications.
The module has four pluggable terminal blocks with three connections each. One block contains the SDI-12
connection to the SDI-12 Data Recorder (+12V power, Ground, and Data). The other three provide
connections for the sensors.
Left Side Top
Right Side Top
Label
Description
Label
Description
SW‟D
Switched Voltage out (+5 or +12)
Vref
Reference Voltage out (2.5V)
D IN
Digital input
GND
Ground
AN4
Analog input 4 / optional digital in
AN1
Analog input 1
Left Side Bottom (SDI-12 connection)
Right Side Bottom
Label
Description
Label
Description
+12
+12V SDI power from recorder
AN2
Analog input 2
GND
Ground connection to recorder
GND
Ground
DATA
SDI-12 data line to recorder
AN3
Analog input 3
The unit comes configured from the factory at SDI-12 address 0 and ready to make analog readings. Just
issue the basic SDI-12 start measurement command “M” to address 0 ( 0M! ) and the unit will initiate a
reading of all four analog inputs. Get the data back with a “D0” command ( 0D0! ) (done automatically by
most data recorders when they are measuring) and the unit will return the four voltage readings (AN1, AN2,
AN3, AN4).
If using with other SDI-12 sensors, then the unit will need to be set to a unique address. This is done with the
change address command ( aAb! ) where “a” is current address and “b” is the new address. The unit needs to
be only SDI-12 module on the bus at address “a” when this command is issued, or you will end up changing
both units to address “b”. For example, to change the address from the factory default of “0” to “2”, issue the
command: 0A2!
All future commands will then need to be sent to address 2.
To query a module as to its address, ensure that it is the only SDI-12 module on the bus and then issue the
address query command: ?!
The unit will respond with its address.
To confirm the SDI-12 communication with a module, the SDI-12 send identification command can be issued
(to address 0 in the example): 0I!
The unit will respond with its identification string. The string from the SDI-12 AnalogPlus module will look
similar to the following: 013 SUTRON 1248-11.0 A1.2
which shows a response from address 0, that the unit supports SDI-12 specification 1.3 (and therefore 1.2,
1.1, and 1.0), that the manufacturer is SUTRON, and that the model is a 1248-1.
Right Bottom
Right Top
Left Bottom
Left Top

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If you need more than a 0-5V single ended voltage reading, then refer to the measurements section of the
manual for further details on configuring the different measurement types.

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3. SDI-12 Commands (Overview)
The commands to set up and operate the SDI-12 AnalogPlus module are those defined by the SDI-
12 specifications plus some extended commands defined by Sutron. The commands are in ASCII
and all the replies use printable ASCII characters followed by <CR> <LF>. The case of the letters is
important. An “A” is not the same as an “a”.
All commands have three components: the device address, the command body, and the command
termination.
The device address is a single character with values 0 to 9, A to Z, and a to z. It is the first character
of a command. It is usually the number 0 (the default address as shipped from the factory) if data
recorder does not have multiple SDI devices connected to it.
The command body and the responses are shown as a combination of upper and lower case letters.
The upper case letters are the fixed portions of the command and the lower case letters are the
variables or values that are replaced by actual numbers. Values are entered in the form of a polarity
sign (or ) followed by up to seven digits, including a decimal point.
The command terminator is an exclamation point (!).
NOTE: ALL SDI-12 COMMANDS ARE UPPER CASE.
The SDI-12 AnalogPlus module replies to all SDI-12 commands it supports. If the SDI-12
AnalogPlus module receives a command it does not support, no reply is made. The reply to a
measurement command (M) will have one of two forms:
a0000
Where a is the address and the 0000 indicates that there is no
further message from SDI-12 AnalogPlus module to send
Or
atttn
followed by
a
Where a is the address, ttt is the amount of time, in seconds,
the SDI-12 AnalogPlus module needs to make the
measurement or process the command and n is the number of
values that can be collected. As soon as the measurement is
over, the sensor will also respond with its address (if ttt is not
000). This response is called a service request.
Setting the Address
The default SDI-12 address is 0.
If you are using the SDI-12 AnalogPlus module connected with other SDI-12 devices, you will need
to change the SDI-12 AnalogPlus module address. Otherwise, skip this section. The address simply
lets multiple devices share the same wiring. When the data recorder needs data from a particular
sensor, it requests data using an address. Only the device with the matching address will reply. For
convenience in setting up the unit when only one sensor is connected, the SDI-12 AnalogPlus
module supports wildcard addresses of asterisk (*) and question mark (?).
In order to set the address by SDI-12 command, no other SDI-12 devices connected to the system
should be set to address 0 or to the desired SDI-12 AnalogPlus module address.