Campbell Hausfeld SDM-SIO4 manual Input Filters, Filter Types, Simple Filters

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SDM-SIO4 User Guide

NOTE	The hex. number must always be two ASCII characters.

Control characters can be entered for all commands in a similar way:

∙^M is carriage return, ^J line feed etc.

∙^^ means ^

∙"" means "

∙]] means ]

∙&& means &

∙&0d means line feed

∙&hex,hex used to enter 2-character hex. codes (0-9, A-F)

3.2 Input Filters

Input filters are used to convert received data into a form that is easy for the datalogger to process. Filters are generally used to strip out the required values from other, unnecessary, data transmitted from the sensor/device. The filters will also convert the required data into a form that the datalogger can use.

	For example, the sensor may output the (unusual) complex string ‘Sample data
	+12.3, 23.567,0xAB,12.4’. From this string you may only require to record the
	hexadecimal number 0xAB. A filter can be set up to strip out only this number,
	and then convert it to a 4-byte floating point number which the datalogger can
	use. The datalogger will then collect this value and place it into an input location –
	in this case as 171 decimal.

NOTE	You must always set up a filter if you want the datalogger to collect
	data from the SDM-SIO4.

3.2.1 Filter Types

Simple Filters

These filters can be set up by the datalogger program, i.e. command line set-up is not necessary. The four filters search for a specific data type to convert to Campbell Scientific floating point format. The SDM-SIO4 continues searching and reading data until it encounters a termination character (if this has been specified in Instruction 113) The filters are as follows:-

∙Search for an ASCII floating point number to convert to Campbell Scientific floating point format.*

∙Search for an ASCII hex pair to convert to Campbell Scientific floating point format.*

∙Search for an 8-bit binary number to convert to Campbell Scientific floating point format.

∙Search for a 16-bit binary number to convert to Campbell Scientific floating point format.

* Non-numeric characters are ignored.

3-2

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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 AddressSelecting RS232 or 5V Logic for Each Port Connections to the SDM-SIO4Transient Protection and Grounding Power-on Tests the Status LED Status LED Error CodesNo. of Flashes Description of error/status Page Understanding How the SDM-SIO4 Handles Data IntroductionMethod of Entering Special / Control Characters Input Filters Filter TypesSimple 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 temperatureCommand Line Operation and Structure Entering CommandsProgramming 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 SDM-SIO4 Configuration Examples Command 2305 Transmit BytesExample CR10X Program End of serial and filter setup Set flag one high so the above will only be done onceGet 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 onceExample CR10X Program using Interrupts Get voltages into locations 3 and 4 if poll was trueInstantaneous value stored into final storage Do filter setup only if flag one is clear Delay required by filter setup commandSet 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 BuffersData Error Detection Error Detection with the SDM-SIO4Received Data SDM-SIO4 User Guide Example of Using Received Data Filters 2 CR10X Program ExampleFltst 100 TFrequency=xg2n10fCCG8 Minimum delay of 4ms is required by the above P113 End of filter setupTell 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