DW2 – DIN for load cells

AUD $105.00 excludes GST

Key Features
  • Fully programmable SPLat controller with all the latest, relevant SPLat features.
  • Network it with 2 wires to other DIN Family members for expanded I/O
  • 2 x load cell / strain gauge inputs with stable excitation voltage
  • 4 x digital I/O lines, 800mA each as outputs
  • RS485 interface. Use for MODBUS, Xwire or your own protocol

AUD $105.00 ex GST

Product Information
  • Description

    DW2

    DW2

    The SPLat DIN Family of controllers are an ideal solution for any job that needs a cheap programmable PLC inside a cabinet. Each product in the DIN Family is a fully programmable controller, so it can either be used by itself or wired up with other family members to get more I/O.

    The DW2 controller has a high resolution 24 bit analogue to digital converter for measuring load cells / strain gauges and converting these measurements into weight.

    The load cell terminals are electrically isolated from the rest of the controller and from the communications ports. This configuration imbues the DW2 with the ability to take stable readings even in an electrically noisy environment.

    Note the DW2 cannot read both load cell inputs simultaneously. Your app must choose which channel to sample. Furthermore, the first few samples will be contaminated with some of the signal from the old channel which simply means we don&t recommend trying to do measurements with 2 channels at high speed.

  • Features

    • Fully programmable SPLat controller with all the latest, relevant SPLat features.
    • Network it with 2 wires to other DIN Family members for expanded I/O
    • 8 –> 24 VDC operation, ~70mA maximum at 24 VDC
    • 2 x load cell / strain gauge inputs with stable excitation voltage
    • 4 x digital I/O lines, 800mA each as outputs
    • RS485 interface. Use for MODBUS, Xwire or your own protocol
    • USB programming port (mini B) (firmware V4.6 or later)
    • TTL Xwire interface
    • TTL serial interface
    • Configurable DIP switches
    • Connects to any SPLat controller with latest Xwire drivers
    • Dimensions: 68mm x 118mm (2.7″ x 4.65″) in DIN holder
    • Has mounting holes for DIN-less mounting
  • USB

    To program this controller you will need this USB driver:

    USB driver

    Once downloaded, unzip, right-click “splat_serial.inf” and choose Install.

  • Firmware

    The firmware download page has the tools and instructions you need for updating your controller’s firmware. The latest firmware is also available here:

    Download DW2 V4.3

    The firmware revision history is available here.
    
    =================
    == Version 4.3 ==
    =================
    03Aug2018
    - VM: comms profile 5 was 8bits, odd_parity, 2stop but should have been no_parity as per MODBUS standards
    - VM: reading the internal analogue reference via a float (ie in the VM) now returns a normalised number based on the ST factory calibration value (multiply by 3.3 to get Vcc)
    - VM: floatFromU was not working correctly for negative numbers.
    - VM: OBLCD_Dim may now be used without throwing an error on boards that only support a virtual LCD, it is simply ignored.
    - STM32F3: can now measure the 3V3 rail based on an internal reference
    - STM32F4: can now read the 3V3 rail
    - VM: A race condition existed in the QuadratureCounter that could cause wrong readings to be returned, often this was seen when moving backwards with the count being returned as a large positive number rather than a small negative number.  Thanks to Michael B for spotting this.
    - VM: ARM controllers now support UVtoNV for NVEM page 1 and up.
    - VM: ARM based OBQC_fGet used to return 0 thru 16777215, but this meant moving backward from 0 would cause a jump to 16777215.  So now it returns negative, which is the same as 8bit SPLat controllers.
    - VM: YieldTask may now be called in single tasking mode without throwing en error.  This is especially useful in subroutines which may be shared by both single and multi-tasking applications.
    - VM: stop I/O messages during app upload
    - DW2 demo, can now choose 485/TTL when there's an Xwire error
    - VM: Oh dear, RTCDateToUV, RTCDMToUV, RTCHHMMToUV, RTCHHMMSSToUV were all incorrectly using the _current_time_ rather than the values in the RTC registers.  So functions like OBLCD_HHMMSS were displaying the current time rather than the time in the RTC registers.
    - VM: the delay between a slave receiving and replying was to quick causing legacy controllers to miss the response, increased to around 500us.
    - VM: Fixed InputOM that was returning wildly incorrect values.
    - VM: SPxChOut is no longer NULL terminated, allowing V to be any value without impacting the data in U.
    - ARM: fixed a reset that could occur if Xwire Slave was restarted when it & MODBUS Slave were operating simultaneously.
    - ARM: WarmBoot now doesn't cause an error, it just restarts the VM.  This is the same behaviour as the 8bit controllers.
    - ARM: SEXI was incorrectly calculating the output size limit, so a value of 37 outputs which is legal was throwing a "too big" error.
    - VM: SPx callbacks modified to receive the registered address, this allow multiple instances to exist.
    - VM: floatFromU and fixToU were corrected to treat W as big endian when transferring between U
    - DW2: default SEXI app now supports address change on the fly and auto detect of TTL/485 ports.
    - ARM STMicro boards: If MODBUS was set to 8 data bits even parity, a 0x00 would cause a LIN break and resulted in the packet being dumped resulting MODBUS errors (typically no response if the SPLat is a MODBUS slave).
    - VM: sometimes a controller running MODBUS would reset when SPLat/PC connected due to an incorrect method of mutex release when closing the MODBUS port.
    - ARM: a 16bit and 24bit ID is now available on all ARM boards.  These are a CRC of a bigger ID so there's a small chance two controllers may have the same ID (chance is obviously less with the 24bit version).
    - VM: fixed a serious bug in fSTTimeSince & STTest that 2 days after the controller is turned on made both functions think the elapsed time is always greater than 167772.16s.
    - ARM: The SPLat/VM on ARM boards was throwing a RAM OutOfBounds error when trying to access byte 250 which is actually the legal last address.
    - VM: Doing a fGetTimer or Test quickly after starting a timer may sometimes have caused the timer to expire immediately.
    - DW2: switching channels wasn't throwing away the rubbish samples.
    - VM: WtoU, QtoU, UtoW, UtoQ, fixToU, floatFromU, would incorrectly error when loading a float into U[16+]=================
    == Version 4.2 ==
    =================
    10 May 2016
    - First formal release
    - DW2: enabled EEPROM driver
    - DW2: V4.2; Now supports 2 ADC channels
    - VM: WaitOnKT wasn't working (incorrect opcode length)
    - VM: GoIfInOn/Off/K were ignoring "J"
    - VM: Fixed STTest which was not working correctly due to a typo. It was especially worse with small delays.
    - VM: NVReadRec & NVWriteRec were incorrectly expecting a 16 bit address but it's only an 8 bit address.
    - VM: A change to detect duplicated slave entries in the Xwire table was preventing correct parsing of the table, meaning slaves often weren't being added to the I/O map.
    - OS: Saw the 1 second timer getting delayed, manifested by ComTestStartTimer taking 13 seconds dignal rather than 10. Due to timers being deleted before the next timer was fetched.
    - VM: ComTestStartTimer now using fast tick to avoid expiring after 9 - 10 seconds (only following RUN from SPLat/PC, power on was always 10s).
    - VM: XwireGetPollCntr now increments as soon as a packet is received rather than at the start of sending the response, this also fixed a problem where poll count was not incrementing if the slave had no data to return; interpacket time delays have been shortend to increase throughput.
    - VM: Fixed display of PermStore values in the "Module" window in SPLat/PC as all bytes were off by 1, thus the first byte was always missing and the "status" was never correct.
    - VM: the Xwire LCD master now sends zeroes for the command bytes (blink, etc) otherwise sending these bytes sent garbage and stuffed up the LCD.
    - VM: SEXI was not working when analogue I/O didn't start at 0
    - OS: analogue output number is now contigous as there would have been problem if a DAC was in the middle of PWM
    - VM: now able to report analogue I/O when numbering doesn't start at 0=================
    == Version 4.0 ==
    =================
    10 Aug 2015
    - First release
    
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