Campbell Hausfeld SDM-SIO4 - page 58

SDM-SIO4 User Guide

6-2

3 CRC16-CCITT-IBM (Tag Receiver).

4 CRC32 standard.

Polynomial x32+x26+x23+x22+x16+x12+x11+x10+x8+x7+x5+x4+x2+x+1.

5 CSI Signature (see Appendix C of the CR10X Manual).

6 Checksum using modulo 256.

7 Checksum using modulo 8192 (See Section 5 of the CR10X Manual).

8-255 For future use.

Gn

This filter type can be added to the filter string to mark the end of the string and

the point where the sensor signature should be. It also sets the data type to use.

When this filter is done, the signature returned from the sensor will be converted

into a standard data type, so the SDM-SIO4 can compare the original signature it

calculated to the one the sensor returned. If the two signatures match, then the

data is ready for the datalogger to collect, but if they do not match, the data will

be removed, as it will be considered to be corrupt data (if no other data is ready

for the datalogger to collect then -99999 for floating point or 255 for single-byte

characters will be stored into the datalogger input location).

From the programmers point of view, the datalogger could be set up to do one of

the following:

1. Poll the SDM-SIO4 to see if data is available.

2. Read the corrupt values as -99999 or 255 into locations and just store them as

normal.

3. Read the values, check to see if they are -99999 or 255, and if so then ask the

device connected to the SDM-SIO4 to re-send the data. Note that the removal

of corrupt data in this way will only work if the Data Set filters are used.

Since Gn is always at the end of a data set, the data will always remain

available for collection by the datalogger unless you define another data set

with the ‘x’ filter.

n can be in the range of 0-255 which is the data type to use.

The data types that the SDM-SIO4 can deal with are as follows:

0 No data type or check

1 8-bit binary. Expects 1 byte

2 16-bit binary least significant byte first. Expects 2 bytes

3 16-bit binary most significant byte first. Expects 2 bytes

4 32-bit binary least significant byte first. Expects 4 bytes

5 32-bit binary most significant byte first. Expects 4 bytes

6 ASCII decimal. Waits until non ASCII 0-9 received

7 8-bit ASCII hex. Expects 2 ASCII bytes, if not 0-9,a-f,A-F then fail

8 16-bit ASCII hex. Expects 4 ASCII bytes, if not 0-9,a-f,A-F then fail

9 32-bit ASCII hex. Expects 8 ASCII bytes, if not 0-9,a-f,A-F then fail

10-255 for future use.

Contents

Main Page Guarantee Page Contents Section 1. Introduction..................................................... 1-1 Section 2. Installation and Hardware Set-Up.................. 2-1 Section 4. Programming the SDM-SIO4.......................... 4-1 Section 5. Programming the SDM-SIO4.......................... 5-1 Figures Tables Section 1. Introduction 1.1 What is the SDM-SIO4? SDM-SIO4 4-Channel Serial I/O Interface User Guide K K K Figure 1 Schematic Diagram of the SDM-SIO4 PORT Command Line Control Datalogger Command Control 1.2 Specifications 1.2.1 Serial Ports Serial Port Buffers 1.2.2 SDM Port 1.2.3 Case 1.2.4 Power Requirements 1.2.5 Environmental Operating Range 1.2.6 Other Key Features Page Section 2. Installation and Hardware Set-Up 2.1 Setting the SDM Address 2.2 Selecting RS232 or 5V Logic for Each Port 2.3 Connections to the SDM-SIO4 2.3.1 Transient Protection and Grounding 2.4 Power-on Tests the Status LED Page Section 3. Understanding How the SDM-SIO4 Handles Data 3.1 Introduction 3.1.1 Method of Entering Special / Control Characters 3.2 Input Filters 3.2.1 Filter Types Simple Filters Filter Strings Page Predefined Filter Strings 3.3 Output Formatting 3.3.1 Simple Output Formatter 3.3.2 Output Format Strings CR10X Program Example Page Section 4. Programming the SDM-SIO4 4.1 Command Line Operation and Structure 4.2 Entering Commands 4.3 Basic Commands fltst [string number] ["filter definition"] strst [string number] ["string definition"] fmtst [string number] ["format definition"] strdelete [string number] 4.4 Advanced Commands version portset [delay] reset hexdump errorres bytewr Section 4. Programming the SDM-SIO4 testio [test#] Page Section 5. Programming the Datalogger 5.1 Instruction 113 Parameters 5.1.1 Parameter 1 Reps 5.1.2 Parameter 2 Address 5.1.3 Parameter 3 Mode 5.2 Commands and Options (Parameters 4, 5 and 6) 5.2.1 Understanding Parameter Options and Returned Values 5.2.2 Command 1: Poll of Available Data 5.2.3 Command 2: Signatures 5.2.4 Command 3: Flush all Receive Buffers 5.2.5 Command 4: Send Data to Datalogger 5.2.6 Command 5: Status 5.2.7 Command 6: Flush Transmit Buffer 5.2.8 Command 7: Activate Command Line 5.2.9 Command 8: Poll Tx Buffers for Data 5.2.10 Command 9: Flush Converted Data Buffer 5.2.11 Command 66: Send Single-Byte Data to Datalogger 5.2.12 Command 67: Get Return Code 5.2.13 Command 320: Send Byte Data to SDM-SIO4 5.2.14 Command 321: Execute Command Line Command Program Example for P113 Command 321 5-7 ;execute the command line string. ;delay large enough (10ms) to allow SDM-SIO4 instruction 321 to finish. 5.2.15 Command 1024: Send String to Device 5.2.16 Command 1025: Transmit a Byte 5.2.17 Command 1026: Serial Port Status First Value Returned Second Value Returned Third Value Returned Fourth Value Returned First Command Option Reset Error Counters 5.2.18 Command 1027: Manual Handshake Mode 5.2.19 Command 2049: Set Communications Parameters Second Command Option (Parameter 6) 5.2.20 Command 2054: Set Up Receive Filter 5.2.21 Command 2304: Transmit String and/or Data to Device (Formatter/Filter) Second Command Option (Parameter 6) String Number or Character Code 5.2.22 Command 2305: Transmit Byte(s) 5.3 SDM-SIO4 Configuration Examples Example CR10X Program 5-15 ;set up a simple filter 1999 search for floating point number. ;the set up filter command requires a delay of 4ms, the nearest we can get ;is 10ms with P22. ;set flag one high so the above will only be done once. ;end of serial and filter setup. 5.3.1 Sensors Where the Datalogger Can Request Data by Sending a Prompt or Using a Handshaking Line Example CR10X Program Using Instruction P113 Command 4 Page 5.3.2 Sensors Which Send Data Out Without Prompting Example CR10X Program without Polling or Interrupts Example CR10X Program using the Polling Method Page Example CR10X Program using Interrupts Page Page 5.4 Outputting Datalogger Data 5.5 Flushing the Input and Output Buffers 5.6 Return Error Codes Section 6. Data Error Detection 6.1 Error Detection with the SDM-SIO4 6.2 Received Data Page 6.2.1 Example of Using Received Data Filters 6.2.2 CR10X Program Example Page Page 6.3 Transmitted Data 6.3.1 Example of Using Transmitted Data Filters 6.3.2 CR10X Program Example 6.3.3 Alternative CR10X Program 6-9 ;use formatter string 100 to set up the CRC16 on port 1 ;A minimum delay of 1ms is required after this command ;use formatter string 101 to transmit the string get data to port 1 ;a minimum delay of 3.8ms is required after this command Page Page Page Appendix A. ASCII Table Page Appendix B. Serial Port Data Transfer Modes B.1 Baud rates B.2 Stop Bits B.3 Data Length B.4 Parity Bits B.5 Serial Handshake Modes