AquiStar CT2X (SDI-12 & Modbus )

Transcription

1 Table of Contents Table of Contents... 1 Specifications... 1 SDI-12 Command Nomenclature... 1 SDI-12 Commands... 1 Setup Commands... 1 Measurement Commands... 2 Request Measurement... 2 Request Measurement with CRC... 3 Concurrent Measurement... 4 Concurrent Measurement with CRC... 5 Modbus Register Definitions... 7 Original Release: November 17, 2009 Updated: March 22, 2010 Corrected responses for M!, MC!, C! and CC! commands. Updated: July 19, 2011 Added salinity and TDS Specifications Power supply voltage: VDC Power supply current Active: 14mA 12.0V Power supply current Sleep: 60µA 12.0V Measurement Latency: Approx. 1.3s Default SDI-12 Address: 0 SDI-12 Command Nomenclature a= Sensor address {crc} = SDI-12 compatible 3-character CRC <cr> = ASCII carriage return character <lf> = ASCII line feed character highlighted values indicate variable data SDI-12 Commands Setup Commands Sensor Identification ai! a13 INWUSA CT2X2.6ssssssssss<cr><lf> Note: 2.6 will change to reflect current firmware revision, ssssssssss = device serial # Acknowledge Active a! a<cr><lf> Address Query?! a<cr><lf> Change Address aab! b<cr><lf> Change address from a to b ENGINEERING DEPARTMENT Page 1 of 7

2 Measurement Commands Note: The default units setting for pressure is PSI. The default units setting for temperature is Celsius. To change these, use the Direct Read Units option under the Configure Advanced menu in the Aqua4Plus Control Software. Conductivity is reported with both linear and non-linear temperature compensation. These are both always reported in µs/cm. Salinity is always reported in PSU, TDS in mg/l. For highest accuracy when measuring salinity, you should have the pressure option installed. If you do not have the pressure option, contact INW for further details. Request Measurement am! Sample: a0024<cr><lf> Read results ad0! avalue1value2value3value4<cr><lf> Value1 =temperature Value3 = conductivity (non-linear µs/cm) am1! Sample: a <cr><lf> am2! Sample: a <cr><lf> Sample: a <cr><lf> am3! Value1 = conductivity (non-linear µs/cm) Sample: a <cr><lf> ENGINEERING DEPARTMENT Page 2 of 7

3 am4! am5! am6! Sample: a <cr><lf> Sample: a <cr><lf> Sample: a <cr><lf> Request Measurement with CRC amc! Sample: a0024<cr><lf> Read results ad0! avalue1value2value3value4{crc}<cr><lf> Value1 =temperature Value3 = conductivity (non-linear µs/cm) amc1! amc2! Sample:a {crc}<cr><lf> Sample: a {crc}<cr><lf> Sample: a {crc}<cr><lf> ENGINEERING DEPARTMENT Page 3 of 7

4 amc3! Value1 = conductivity (non-linear µs/cm) Sample: a {crc}<cr><lf> amc4! amc5! Sample: a {crc}<cr><lf> amc6! Sample: a {crc}<cr><lf> Sample: a {crc}<cr><lf> Concurrent Measurement ac! Sample: a00204<cr><lf> Read results ad0! avalue1value2value3value4<cr><lf> Value3 = conductivity (non-linear µs/cm) ac1! Sample: a <cr><lf> Sample: a <cr><lf> ENGINEERING DEPARTMENT Page 4 of 7

5 ac2! Sample: a <cr><lf> ac3! Value1 = conductivity (non-linear µs/cm) Sample: a <cr><lf> ac4! ac5! ac6! Sample: a <cr><lf> Sample: a <cr><lf> Sample: a <cr><lf> Concurrent Measurement with CRC acc! Sample: a00204<cr><lf> Read results ad0! avalue1value2value3value4{crc}<cr><lf> Value3 = conductivity (non-linear µs/cm) Sample:a {crc}<cr><lf> ENGINEERING DEPARTMENT Page 5 of 7

6 acc1! acc2! Sample: a {crc}<cr><lf> Sample: a {crc} <cr><lf> acc3! Value1 = conductivity (non-linear µs/cm) Sample: a <{crc} cr><lf> acc4! acc5! Sample: a {crc} <cr><lf> acc6! Sample: a <{crc} cr><lf> Sample: a {crc} <cr><lf> ENGINEERING DEPARTMENT Page 6 of 7

7 Modbus Register Definitions All Modbus data is accessed as holding registers (4xxxxxx), using the Read Holding Registers (command type 3) and Preset Multiple Holding Registers (command type 0x10) Modbus commands. Parameter data Modbus parameter data is returned as 32-bit ieee floating point values. Each value is 32 bits in length, and therefore occupies two Modbus registers. As a result, the parameter registers must be read as pairs. Modbus Register Data Address Description xF480 (62592) Temperature xF482 (62594) Conductivity Linear (µs/cm) xF484 (62596) Conductivity Non-linear (µs/cm) xF486 (62598) Pressure (psi) xF488 (62600) Salinity (psu) xF48A (62602) TDS (mg/l) Note: The default units setting for pressure is PSI. The default units setting for temperature is Celsius. To change these, use the Direct Read Units option under the Configure Advanced menu in the Aqua4Plus Control Software. Conductivity is reported with both linear and nonlinear temperature compensation. These are both always reported in µs/cm. Sensor configuration/control Modbus registers are provided for the following configuration and control functions. Modbus Register Data Address Description =a 0xF600 (62976) Set sensor Modbus address = a (Write Only) =b 0xFC20 (64544) Set Modbus baud rate according to b (Write Only) b=0:38400 b=1:19200 b=2: xF610 (62992) Front end firmware version (Read Only) AquiStar is a registered trademark of Instrumentation Northwest, Inc. Modbus is a registered trademark of Scheinder Electric. ENGINEERING DEPARTMENT Page 7 of 7