Model 4046 SDI Sensor
Instruction Manual 60-0004046-00
1.0 INTRODUCTION
1.1. General Description:
The model 4046 SDI Sensor provides an interface to convert inputs from two
(2) analog sensors and one (1) tipping bucket to an SDI serial data interface.
The 4046 also provides internal measurements of battery voltage and
ambient temperature.
1.2. Specifications:
Size 3.5”LX0.75”WX2.1”H
Weight 1.9 oz.
Operating Temperature -30-60Degrees Centigrade
Power requirements 12 VDC
<200 uA during sleep
<1 A for sensor power
Mounting: Din Rail
Connections: Screw Terminal
Wire Size #24-#14 AWG
Inputs: Gnd, + 12VDC, (2) Analog 0- 5VDC
Tipping Bucket (contact closure to ground
Communication: SDI -12 (version1.1 compliant)
Sensor Power: 12VDC or 5.00VDC (jumper selectable)
2.0 OPERATION
The 4046 responds to all basic SDI commands. The sensor power is switched
on after successfully decoding a “Start Measurement” command and switched off at
the completion of the measurement. The duration (sensor warm-up time is
programmable using SDI commands. The 4046 will go into low power sleep state
when it is not being polled. User values for Slope (multiplier) and Offset (adder) are
programmable for both analog channels and tipping bucket. The tipping accumulator
can be set to zero by SDI command.
2.1. Connections:
Analog inputs from the (2) external sensors are connected to ANA in1
and ANAin2 respectively with the common (ground reference) connection at
ANA Gnd. Take care to observe polarity and limit the voltage input to 5V dc.
The input ANAin1 corresponds to SDI parameter 0 (first) and its Slope and
Offset values correspond to “A”. Input ANAin2 corresponds to SDI parameter
1 (second) and its Slope and Offset values correspond to “B”. The EVNT In
corresponds to SDI Parameter 2 (third) and its Slope and Offset correspond
to “C”. Sensor Power (either 12VDC or 5.00VDC) is switched on before the
Analog measurement takes place. The sensor warm-up time is user
programmable. External power sources for the sensor other than the
switched power may cause problems with the Analog measurement if
they are energized before the internal switched power is activated.
3.0 SDI COMMANDS
All input and response characters are in ASCII format, 1200 baud, even
parity.
‘a’ denotes the sensor address.
Note: If second command is sent to the sensor after starting a measurement,
but before the measurement is ready, the sensor will abort the measurement.
Acknowledge Active:
Returns a response acknowledging that the sensor unit is
active.
command a! sensor response a<CR><LF>
Send Identification:
Returns SDI version, company name, sensor model #, sensor version#.
command aI! sensor response allccccccccmmmmmmvvv<CR><LF>
II= SDI version ccccccc=8 character vender ID mmmmmm=6 character model
ID vvv= 3 character sensor version
Address Query:
Returns address for sensor. (Note Only one sensor may be on
the buss for this query)
command ?! sensor response a<CR><LF>
Start Verification: Returns a string that imitates a checksum.
command aV! sensor response a0011<CR><LF>
Change Address:
Change the address of the sensor unit. Valid addresses are
those in the range ‘O’ to ‘9’, A to Z’.
command aAb! sensor response b<CR><LF>
b is the new sensor address.
Start measurement
: The unit reads five sensor devices: two external analog
sensors, a tipping bucket counter, a battery voltage sensor, and an on-board
temperature sensor. These are divided into two measurement groups.
Group 1 contains data from the two analog sensors and the tipping bucket.
Group 2 contains data from the internal temperature sensor and battery
voltage.
To collect data from the group 1 sensors: command: aM!
sensor response: attt3<CR><LF>
3 Measurements will be ready in ttt seconds. Upon completion of the measurements
a service request will be issued. a<CR><LF>
To collect data from the Group 2 sensors: command: aM1!
sensor response A0012<CR><LF
2 Measurements will be ready in 1 second. Upon completion of the measurements a
service will be issued.
Send Data
: The format of the data is determined by the preceding command. If
Group 1 measurement results are being returned then data can contain three
numbers. If Group 2 measurement results are being returned then the data will
contain two numbers. All numbers in a data group are preceded with the sign of the
number, either ‘+’ or ‘-‘.
command aDO! sensor response axxxx…xx<CR><LF>
xxx.xx up to 32 characters
The input ANAin1 corresponds to SDI parameter o (first) and its Slope and Offset
values correspond to “A”. Input ANAin 2 correspond to SDI parameter 1 (second)
and it Slope and offset values correspond to “B”. The EVNT IN corresponds to SDI
parameter 2 (third) and its Slope and Offset correspond to “C’
Change temperature Scale :
The default scale is Fahrenheit.
To select the Celsius scale: command aXTC!
sensor response a0011<CR><LF>
To select the Fahrenheit scale:
command aXTF!
sensor response a0011<CR><LF>
service request a<CR> <LF>
Results retrieved using a send data command (aD0!)
afahrenheit<CR><LF> or aCelius <CR><LF>
Change Sensor Warm-up Time:
The analog sensors have a variable warm-up
time. The sensor warm-up time can be 1to 255 seconds. The default time is 4
seconds.
command aXSWttt!
where ttt is the new sensor warm-up time.
sensor response a0011<CR><LF>
service request a<CR><LF>
The data is retrieved using a Send Data command (aDO!):
Warmup=tttsec<CR><LF>
Clear Tipping Bucket Accumulator
This command will “zero” the “precip” count.
command: aXZP!
sensor response: a0011<CR><LF>
service request a<CR><LF>
Results retrieved using a Send Data command (aDO!):
a Tip=0 Offset =(offset value)Slope = (slope value)<CR><LF>
Turn Analog Power ON: This command will “Switch ON” the 12V power output to
the external analog sensor(s). command aXON!
sensor response a0001<CR><LF>
service request a<CR><LF>
Results retrieved a send data command (aDO!): aVsw on for 25 sec
Analog power will remain on for at most 25 seconds or until the next read of the
sensor.
Turn Analog Power OFF
the external analog sensor(s).
command aXOFF!
sensor response a0001<CR>LF>
service request a<CR><LF>
Results retrieved using a send data command (aDO!) : a Vsw OFF
Write User Defined Slope:
defined slope (scaling) factors. The scaling factors can be real numbers in the
range. Default slope values are 1.000.
command aXWScsxxxxxxx!
sensor response a0011<CR><LF>
service request a<CR>LF>
where c is the channel selector: A=channel A,channel B, c for EVNTin (tipping
bucket),s is the sign of the number: +or -,x is the numeric value. The response
shows 1 data value will be ready in 1second upon which time a service request is
issued by the sensor.
Write User Defined Offset
The default value is 0.000
command aXWOcsxxxxxxx!
sensor response a0011<CR><LF>
service request a<CR><LF>
where c is the channel selector: c =A for ANAin1, B for ANAin 2, C for EVNTin
(tipping bucket), s is the sign of the number ( + or -), x is the numeric value. The
response shows 1 data value will be ready in 1 second upon which time a service
request is issued by the sensor.
: This command will “Switch Off” the 12 V power output to
The analog sensors and the tipping bucket have user
: The analog sensors have a user defined offset value.
Read User Defined Offset
: Puts the value of the user defined offset value in the
data return buffer. The data is retrieved by a return data command.
command a XROc! sensor response a0011<CR><LF>
service request a<CR><LF>
Where c is the channel selector: c= A for channel A, B for channel B,
C for EVNTin (tipping bucket)
The response shows that 1 data value will be ready in 1 second upon which time a
service request is issued by the sensor.
4.0 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.
5.0 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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