Data Error Detection | Campbell Hausfeld SDM-SIO4 specification

Section 6. Data Error Detection

1	8 bit binary	0.155ms
2,3	16 bit binary	0.216ms
4,5	32 bit binary	0.334ms
6	ASCII decimal	1.125ms
7	8 bit ASCII hex	0.226ms
8	16 bit ASCII hex	0.355ms
9	32 bit ASCII hex	0.613ms

The above timings are preliminary.

With the CRC32 and CRC16-CCITT there is a extra 0.19ms for an additional calculation. This is required as part of the CRC algorithm.

The total extra processing time above the SDM-SIO4’s normal delays is calculated by the following:

Total time in µsec needed before the next P113 is started =

a+(one from b)+(one from c)+(d if applicable)+any other delays required by the format command

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Campbell Hausfeld SDM-SIO4 manual Data Error Detection

Contents

Issued Page Guarantee Page Contents Appendix A. Ascii Table Data Error Detection Introduction What is the SDM-SIO4? Datalogger Command Control Serial Port Buffers SpecificationsSDM-SIO4 Serial Port Pin Configuration Serial Ports Environmental Operating Range Power RequirementsSDM Port Case Other Key Features Page Selector Block Settings SDM Address Installation and Hardware Set-UpSetting the SDM Address Address Settings Connections 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 Filter No Filter String Used Output FormattingSimple Output Formatter Predefined Filter Strings Output Format Strings CR10X Program Example Fmtst 123 z261 f62 iBattery z257 f61z273 Get panel temperature Get battery voltage Entering Commands Command Line Operation and StructureProgramming the SDM-SIO4 Basic Commands Advanced Commands WD n Wderr n Wdaddr n ErrorresHexdump start address number of bytes Bytewr address byte Testio returns Testio test#Page Instruction 113 Parameters Programming the Datalogger Parameters 9 and 10 Multiplier and Offset Commands and Options Parameters 4, 5Parameter 7 Values per Rep Parameter 8 Starting Input Location Understanding Parameter Options and Returned Values Command 1 Poll of Available Data Command 5 Status Command 2 SignaturesCommand 3 Flush all Receive Buffers Command 4 Send Data to Datalogger Command 9 Flush Converted Data Buffer Command 6 Flush Transmit BufferCommand 7 Activate Command Line Command 8 Poll Tx Buffers for Data Program Example for P113 Command Command 67 Get Return CodeCommand 320 Send Byte Data to SDM-SIO4 Command 321 Execute Command Line Command Execute the command line string First Value Returned Command 1024 Send String to DeviceCommand 1025 Transmit a Byte Command 1026 Serial Port Status Fourth Value Returned First Command Option Reset Error CountersSecond Value Returned Third Value Returned Command 2049 Set Communications Parameters Command 1027 ‘Manual’ Handshake Mode Second Command Option Parameter First Command Option Parameter Command 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 Strst 101 Send DataJM Example CR10X Program Using Instruction P113 Command Wait long enough for sensor to send data Set up the filter and then send string Instantaneous sample form the sensor Sensors Which Send Data Out Without PromptingGet data from SDM-SIO4 and put into locations 1 Time stamp Fltst 200 tdataA5xff Example CR10X Program without Polling or Interrupts Instantaneous values stored to final storage Example CR10X Program using the Polling MethodEnd of set up Get the two floating point values from the SDM-SIO4 Set flag one high so the filter set-up is only done once Set up string filterDelay required by filter set-up command Do filter set-up only if flag one is clear Get 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 End of interrupt routine Interrupt routine for control portGet voltages into locations 3 Instantaneous readings stored into final storage Outputting Datalogger Data Flushing the Input and Output Buffers Return Error Codes Error 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 CRC32 Transmitted Data Fmtst 100 g1i123456789G8 Example of Using Transmitted Data Filters Fmtst 100 g1 Fmtst 101 isome data Fmtst 102 f62 G8 Alternative CR10X Program Send the Ascii characters ‘Y’ and ‘Z’ to port Use formatter string 100 to set up the CRC16 on portMinimum delay of 1ms is required after this command Minimum delay of 3.8ms is required after this command CRC16-CCITT-IBM Data Error Detection Page Dec Char Appendix A. Ascii TablePage Data Length Appendix B. Serial Port Data Transfer ModesBaud rates Stop Bits Serial Handshake Modes Parity Bits