Campbell Hausfeld SDM-SIO4 SDM Port, Case, Power Requirements, Environmental Operating Range

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SDM-SIO4 4-Channel Serial I/O Interface User Guide

1.2.2 SDM Port

This serial port is to connect to the SDM port of the datalogger, e.g. via C1, C2 and C3 on a CR10X. The port is a set of screw terminals marked C1, C2, C3, I/O, +12 and G. C3 is the Synchronous Device Enable line, C1 is the Data line, C2 is the Clock line and I/O is a special-purpose Interrupt line.

The Interrupt line can be used with some dataloggers to tell the datalogger to collect data from the sensor. The SDM-SIO4 pulses the I/O line for 50ms every 250ms if there is data available for the datalogger to collect. This can be used for sensors which send out data without prompting. For dataloggers which support interrupt-driven subroutines this can simplify program operation.

The SDM port is used by the datalogger to communicate with the SDM- SIO4 and other SDM peripherals. The speed at which data is transferred is under the control of the datalogger and this can vary with other activities in the datalogger and also the length of the SDM cables. The typical transfer speed to and from the SDM is one byte per millisecond.

Multiple SDM-SIO4s can be connected to the datalogger in parallel with other SDM-SIO4s or other SDM devices. The only difference would be the SDM address of each device.

NOTE For high speed communications the SDM cable should be kept as short as possible and connections made using screened cable. The cable between the SDM-SIO4 and the datalogger should not exceed 3m in length.

1.2.3 Case

The case is made of anodised aluminium. It has four slots for 9-way ‘D’ connectors and one slot for the SDM 6-way screw terminals. There is a momentary push-button switch for command line activation. The size of the case is 184 x 88 x 34mm. There is a tab at each end to allow for vertical mounting.

1.2.4 Power Requirements

The SDM-SIO4 has a typical quiescent current consumption of about 0.7mA. This increases to about 29mA with all 4 ports active. The quiescent state is entered if there has been no SDM or port activity for approximately 30ms.

The unit can be powered from an unregulated 12V supply (acceptable range 9 - 18V DC).

1.2.5 Environmental Operating Range

-25°C to +50°C (contact Campbell Scientific for extended temperature requirements)

0 - 95% RH (non-condensing)

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Contents Issued Page Guarantee Page Contents Data Error Detection Appendix A. Ascii TableWhat is the SDM-SIO4? IntroductionDatalogger Command Control Serial Ports SpecificationsSDM-SIO4 Serial Port Pin Configuration Serial Port BuffersCase Power RequirementsSDM Port Environmental Operating RangeOther Key Features Page Address Settings Installation and Hardware Set-UpSetting the SDM Address Selector Block Settings SDM AddressConnections to the SDM-SIO4 Selecting RS232 or 5V Logic for Each PortTransient Protection and Grounding Status LED Error Codes Power-on Tests the Status LEDNo. of Flashes Description of error/status Page Introduction Understanding How the SDM-SIO4 Handles DataMethod of Entering Special / Control Characters Filter Types Input FiltersSimple Filters Filter Strings Ibn8Ficn8F Predefined Filter Strings Output FormattingSimple Output Formatter Filter No Filter String UsedOutput Format Strings Fmtst 123 z261 f62 iBattery z257 f61z273 CR10X Program ExampleGet battery voltage Get panel temperatureEntering Commands Command Line Operation and StructureProgramming the SDM-SIO4 Basic Commands Advanced Commands Bytewr address byte ErrorresHexdump start address number of bytes WD n Wderr n Wdaddr nTestio test# Testio returnsPage Programming the Datalogger Instruction 113 ParametersParameter 8 Starting Input Location Commands and Options Parameters 4, 5Parameter 7 Values per Rep Parameters 9 and 10 Multiplier and OffsetCommand 1 Poll of Available Data Understanding Parameter Options and Returned ValuesCommand 4 Send Data to Datalogger Command 2 SignaturesCommand 3 Flush all Receive Buffers Command 5 StatusCommand 8 Poll Tx Buffers for Data Command 6 Flush Transmit BufferCommand 7 Activate Command Line Command 9 Flush Converted Data BufferCommand 321 Execute Command Line Command Command 67 Get Return CodeCommand 320 Send Byte Data to SDM-SIO4 Program Example for P113 CommandExecute the command line string Command 1026 Serial Port Status Command 1024 Send String to DeviceCommand 1025 Transmit a Byte First Value ReturnedThird Value Returned First Command Option Reset Error CountersSecond Value Returned Fourth Value ReturnedCommand 1027 ‘Manual’ Handshake Mode Command 2049 Set Communications ParametersFirst Command Option Parameter Second Command Option ParameterCommand 2054 Set Up Receive Filter String Number or Character Code Command 2305 Transmit Bytes SDM-SIO4 Configuration ExamplesExample CR10X Program Set flag one high so the above will only be done once End of serial and filter setupGet two floating point numbers into locations 1 Example CR10X Program Using Instruction P113 Command Strst 101 Send DataJMSet up the filter and then send string Wait long enough for sensor to send dataTime stamp Sensors Which Send Data Out Without PromptingGet data from SDM-SIO4 and put into locations 1 Instantaneous sample form the sensorExample CR10X Program without Polling or Interrupts Fltst 200 tdataA5xffGet the two floating point values from the SDM-SIO4 Example CR10X Program using the Polling MethodEnd of set up Instantaneous values stored to final storageDo filter set-up only if flag one is clear Set up string filterDelay required by filter set-up command Set flag one high so the filter set-up is only done onceGet voltages into locations 3 and 4 if poll was true Example CR10X Program using InterruptsInstantaneous value stored into final storage Delay required by filter setup command Do filter setup only if flag one is clearSet control port 8 to i/p so it can be used as an interrupt Instantaneous readings stored into final storage Interrupt routine for control portGet voltages into locations 3 End of interrupt routineOutputting Datalogger Data Return Error Codes Flushing the Input and Output BuffersError Detection with the SDM-SIO4 Data Error DetectionReceived Data SDM-SIO4 User Guide 2 CR10X Program Example Example of Using Received Data FiltersFltst 100 TFrequency=xg2n10fCCG8 End of filter setup Minimum delay of 4ms is required by the above P113Tell the SDM-SIO4 to use filter string End of get data Transmitted Data CRC32Example of Using Transmitted Data Filters Fmtst 100 g1i123456789G8Alternative CR10X Program Fmtst 100 g1 Fmtst 101 isome data Fmtst 102 f62 G8Minimum delay of 3.8ms is required after this command Use formatter string 100 to set up the CRC16 on portMinimum delay of 1ms is required after this command Send the Ascii characters ‘Y’ and ‘Z’ to portCRC16-CCITT-IBM Data Error Detection Page Appendix A. Ascii Table Dec CharPage Stop Bits Appendix B. Serial Port Data Transfer ModesBaud rates Data LengthParity Bits Serial Handshake Modes