Power-on Tests the Status LED | Campbell Hausfeld SDM-SIO4 manual

Section 2. Installation and Hardware Set-Up

∙Electrical noise causing possible loss or corruption of serial data.

∙Electrical noise being transferred back to the datalogger causing errors on analogue measurements.

∙Long term damage in the form of corrosion caused by current flowing along electro-chemical gradients.

If it is not possible to prevent a ground loop, or if electrical noise is found to be a problem, it may be necessary to add an opto-isolated interface to the output of the SDM-SIO4 serial port. Please contact Campbell Scientific for further details.

Even if ground loops can be prevented, the length of cables that can be used for RS232 signals is limited to a few tens of metres (the exact length depending on the RS232 driver hardware and the cable used). Short-haul modems can be added to the SDM-SIO4 to allow cables up to several kilometres to be used and in addition providing ground isolation (please contact Campbell Scientific for further details).

2.4 Power-on Tests — the Status LED

When the SDM-SIO4 is powered up or has been reset by the internal watchdog hardware it flashes the red LED on the front panel in the following way to indicate status:

	Table 3 Status LED Error Codes
No. of Flashes	Description of error/status.
1	SDM-SIO4 is working correctly.
2	SDM-SIO4 EPROM signature failure.
3	SDM-SIO4 internal battery must be replaced.

NOTE 1: The LED flashes for 1 second on and 1 second off. The LED will also illuminate when the front panel switch is pressed.

NOTE 2: The LED may take up to 4 seconds before it flashes after power up.

2-3

Image 15

Campbell Hausfeld SDM-SIO4 manual Power-on Tests the Status LED, Status LED Error Codes

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 Selecting 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 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 Command Line Operation and Structure Entering CommandsProgramming 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 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 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 Example 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 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 Data 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 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