Campbell Hausfeld SDM-SIO4 6.3 Transmitted Data

SDM-SIO4 User Guide

6-6

1,2 CRC16 and CRC16-CCITT 0.159ms/char.

3 CRC16-CCITT-IBM 0.159ms/char.

4 CRC32 0.369ms/char.

5 CSI Signature 0.077ms/char.

6 Checksum using modulo 256 0.066ms/char.

7 Checksum using modulo 8192 0.071ms/char.

c

The time for the different data types is shown below. Note that this is the time

needed to convert the received signature into a known format and is done at the

end of the signature calculation before the compare. The ASCII decimal

conversion timing is for a number with ten or more digits. If the number is less

than this, the 1.125ms figure shown would reduce by 0.1ms per digit.

1 8 bit binary 0.155ms

2,3 16 bit binary 0.216ms

4,5 32 bit binary 0.334ms

6 ASCII decimal 1.125+(0.075*characters)ms

7 8 bit ASCII hex 0.226ms

8 16 bit ASCII hex 0.355ms

9 32 bit ASCII hex 0.613ms

d

When using CRC32 and CRC16-CITT there is a extra 0.19ms for an additional

calculation. This is required as part of the CRC algorithm.

The total extra processing time over and above the SDM-SIO4’s normal delay is

calculated by the following:

The extra time, in milliseconds, you must wait before trying to get the data from

the SDM-SIO4 = a+(one from b)+(one from c)+(d if applicable)

6.3 Transmitted Data

The SDM-SIO4 can also do transmission signature generation with the calculated

signature appended to the end of the string. This is done by the formatter types ‘g’

and ‘G’. Formatter type ‘g’ is used to mark where signature calculation should

start and the type of signature/CRC to use. Formatter type ‘G’ is used to mar k the

end of signature generation, the position in the string where the calculated

signature will be transmitted and the transmitted signature data format. The

formatter types are described in detail below:

gn

This formatter type can be put into the formatter string to mark the start of a

signature generation. When this happens the signature type determined by ‘n’ will

be initialised ready to start signature calculation for all characters until formatter

Gn is encountered. ‘n’ can be in the range of 0-255. The signature types supported

are shown below:

0 No Signature type used.

1 CRC16 standard. Polynomial x16+x15+x2+1.

2 CRC16-CCITT standard. Polynomial x16+x12+x5 +1.

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.

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