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Solartron Metrology AMETEK ORBIT ACS Series, Manual

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Solartron Metrology AMETEK ORBIT ACS Series Manual Download Page 48

16 MODBUS BASED SERIAL COMMUNICATIONS PROTOCOL

16.1 INTRODUCTION

The SI series of products support the Modbus communications protocol. More information regarding the Modbus protocol can be 
found online at 

www.modbus.org

, with the full specification downloadable here: -

http://www.modbus.org/docs/Modbus_Application_Protocol_V1_1b.pdf

 
Modbus Communications can be performed over a number of hardware layers including RS232 (single point-to-point 
communications) and RS485 (multi-drop network communications).

The SI100 and SI200 are Modbus slaves. They can be given a Modbus address (set in comm menu). A Modbus master can read 
and write from the units to set parameters or read from parameters. The Modbus parameter table for the device family is detailed in  

section 14.2.8

.

The SI range supports Modbus RTU and Modbus ASCII . Modbus RTU uses raw binary data whereas Modbus ASCII uses the data 
encoded as ASCII. (RTU is the most widely used).

16.2 OVERVIEW OF MODBUS COMMUNICATIONS

16.2.1 Modbus Master/Slave

The Modbus protocol is a Master/Slave (or Client/Server) system, with a single ‘Master’ controlling a network of one or more ‘Slaves’.
 
The Master unit controls all communications, so whether it needs to read from one slave unit (reading inputs), write to another 
(setting outputs/configuration), or transfer information from one unit to another, it does so with a command/response message pair.

503110 - Orbit ACS Manual

Issue 9

48 of 63 

Summary of Contents for AMETEK ORBIT ACS Series

Page 1: ......

Page 2: ...02914 Orbit Module Manual Contains specific information for the Analogue Input Module AIM 503113 SI100 SI200 Quick Keypad Guide 503116 Orbit ACS Modbus Parameter Map SI100 SI200 503166 Orbit ACS Modbus Parameter Map SI400 1 2 TRADEMARKS AND COPYRIGHTS Information in this document is subject to change without notice No part of this document may be reproduced or transmitted in any form or by means e...

Page 3: ...nd alone readouts Each module contains an integral LCD display and keypad for setting up and visual display of measurements Basic Input output is provided by discrete lines or a serial interface configured in various ASCII formats or Modbus RTU over RS485 or RS232 For larger measurement systems Solartron s Orbit Digital Measurement System which is a PC based system may be a more flexible solution ...

Page 4: ...ing this equipment is not intended for safety critical applications Warning do not exceed maximum ratings as specified in this document under individual modules Caution Low Voltage This equipment operates below the SELV and is therefore outside the scope of the Low Voltage Directive Service and Repair CAUTION This equipment contains no user serviceable parts Return to supplier for all service and ...

Page 5: ...2 1 SCOPE 3 2 2 NAVIGATE THIS DOCUMENT 3 3 SAFETY SUMMARY 4 4 TABLE OF CONTENTS 5 5 GLOSSARY OF TERMS AND BASIC SYSTEM INFORMATION 9 5 1 TERMS ASSOCIATED WITH THE ORBIT ACS HARDWARE 9 6 MECHANICAL INSTALLATION 10 7 ELECTRICAL INSTALLATION 11 7 1 PC System Requirements 11 7 1 1 PC Hardware Requirements 11 503110 Orbit ACS Manual Issue 9 5 of 63 ...

Page 6: ...APPLICATION 14 9 FUNCTIONS AND DISPLAYS 16 9 1 SI100 and SI200 DISPLAYS 17 9 2 SI100 and SI200 ACTIONS 18 9 3 MENU SCREENS 22 9 3 1 Top Level Menu 23 9 3 2 Configure Probe s 24 9 3 3 Probe Sub menus 25 9 3 4 Measure Menu 27 9 3 5 Peak Preset Limits and Misc Menu 29 9 3 6 Output Input and Communications Menu 30 9 4 COMMON ERROR MESSAGES STATUS CODES 31 9 4 1 Display Error messages 31 9 4 2 Detachab...

Page 7: ...ASCII BASED SERIAL COMMUNICATIONS PROTOCOL 41 15 1 Orbit ACS Serial Communications Protocol 41 15 2 SI3500 Compatibility Protocol 44 15 3 SI1500 Compatibility Protocol 45 15 4 C55 Compatibility Protocol 46 15 5 ASCII Character Set 47 16 MODBUS BASED SERIAL COMMUNICATIONS PROTOCOL 48 16 1 INTRODUCTION 48 16 2 OVERVIEW OF MODBUS COMMUNICATIONS 48 16 2 1 Modbus Master Slave 48 16 2 2 Modbus Unit ID 4...

Page 8: ...DWIDTH 55 18 MISCELLANEOUS 56 18 1 FIRMWARE UPGRADES 56 19 RETURN OF GOODS 57 20 SI400 APPENDIX 58 20 1 SI400 Summary 58 20 2 Section 9 1 SI100 and SI200 DISPLAYS 58 20 2 1 Screen 1 2 58 20 2 2 Screen 3 59 20 3 Section 9 2 SI100 and SI200 ACTIONS 60 20 4 SECTION 9 3 MENU SCREENS 61 20 5 SECTIONS 11 OUTPUTS 12 DIGITAL INPUTS 61 20 6 SECTION 15 1 Orbit ACS Serial Communications Protocol 62 21 REVISI...

Page 9: ... Lines into the SI Series that allow remote control of certain parameters Discrete Outputs Lines out of the SI Series that can be used to drive external loads These can be set either as NPN or PNP configuration Serial Interface Either ASCII protocols as defined in this manual or Modbus RTU or Modbus ASCII The serial bus can be configured as either RS232 or RS485 signal levels Digital Probe A stand...

Page 10: ...of the SI400 which allows three Digital probes to be connected to form a four channel product 6 MECHANICAL INSTALLATION The SI Series products are not a sealed instrument and care should be taken when installing the instrument in environments where contamination can come into contact with the unit It is advisable to protect the unit and if regular access to the keypad is required use a remote swit...

Page 11: ...Windows XP or later Solartron Orbit3 Support Pack For Windows 7 2 INSTALLING THE ORBIT3 SUPPORT PACK FOR WINDOWS SOFTWARE Important Please ensure that you have Administrative access rights for installing this software Before you can use the Orbit ACS configurator utlity you must have the Orbit3 Support Pack for Windows software installed on your computer this is freely available from the Solartron...

Page 12: ...232 connection the 0V connection must be connected to the RS232 GND DO NOT CONNECT ANY POWER SOURCES TO THE 9 WAY D DYPE OF THE SI200 SI400 503110 Orbit ACS Manual Issue 9 12 of 63 This section describes how to connect the unit ...

Page 13: ...robe s are mounted on a DIN rail additional grounding can be performed using the grounding bracket see diagram The digital probe has two indication LEDS The blue led is on when the SI200 SI400 and digital probe s are communicating The red led will flash if there is not enough power reaching it This may indicate a fault with the SI200 SI400 If the unit is the first or last device in a multi drop RS...

Page 14: ...al interference such as welders machine tools cutting and stamping machines Connections should be made using screened cable Braided or foil screened cables may be used The cable screen should be connected to the Orbit ACS unit at the 0V connection In some particularly noisy environments it may be necessary to add ferrite filter components on power and or data cables When selecting the type of wire...

Page 15: ...elf and enables the user to save a unit s configuration and then load the same configuration onto other units The configurator has multiple tabs see below Each will display and allow adjustment of their respective settings 503110 Orbit ACS Manual Issue 9 15 of 63 ...

Page 16: ...S This section describes the operation of the SI100 and SI200 section 20 SI400 Appendix should be referred to for differences between these products and the operation of the SI400 unit 503110 Orbit ACS Manual Issue 9 16 of 63 ...

Page 17: ...9 1 SI100 AND SI200 DISPLAYS 503110 Orbit ACS Manual Issue 9 17 of 63 ...

Page 18: ... 2 SI100 AND SI200 ACTIONS The SI100 and SI200 can perform actions either via the keypad or the 4 discrete inputs The Actions are described in the following table 503110 Orbit ACS Manual Issue 9 18 of 63 ...

Page 19: ... ZERO All further measurements are with respect to this new zero Example If the measuring range is 0 to 10mm and the absolute reading is 4mm on PriZERO action the display and value of the serial output will be zero Then if the probe is moved to it to an absolute position of 6mm the display and serial output will indicate 2mm PriPreset Sets the Primary Channel on SI200 to PRESET Mode directly displ...

Page 20: ...y Channel on SI200 into PEAK mode The display shows the most negative value SecPKRST RESETS the Secondary Channel to the current probe reading when in PEAK or PEAK type measurement The display shows the current probe reading immediately following the PKRST action and then operates as either PEAK or PEAK depending on which measurement type is set SecABS Sets the Secondary Channel on SI200 to ABSOLU...

Page 21: ... SBMxRST If the Secondary display is MaxB MinB resets the Maximum B value to zero SBMnRST If the Secondary display is MaxB MinB resets the Minimum A value to 0 SMxMnRST If the Secondary display is MaxB MinB resets this value to zero or the PRESET value 503110 Orbit ACS Manual Issue 9 21 of 63 ...

Page 22: ... by the magnitude of the digit selected see below TIP Set the most significant digits first 503110 Orbit ACS Manual Issue 9 22 of 63 1000 100 10 1 1 10 1 100 1 1000 1 10000 1 100000 1 1000000 Min 1000 100 10 1 0 1 0 01 0 001 0 0001 0 00001 0 000001 Max 9999 999 90 9 0 9 0 09 0 009 0 0009 0 00009 0 000009 Examples 2 1 2 3 4 1 1 2 3 4 2 1234 1 1 1234 0 1 2 3 4 1 1234 1 0 1234 0 8 7 6 6 0 1234 1 0 87...

Page 23: ...9 3 1 Top Level Menu 503110 Orbit ACS Manual Issue 9 23 of 63 ...

Page 24: ...9 3 2 Configure Probe s 503110 Orbit ACS Manual Issue 9 24 of 63 ...

Page 25: ...mA could be modified to produce 0 100 by setting the ReOffset parameter to 0 and the ReScale parameter to 100 Note1 Whenever a module is added the ReScale and ReOffset parameters are reset to the module Scale and Offset Note2 LT modules have an unknown scale and will default to a scale of zero when added the ReScale parameter therefore needs to be configured before an LT type module can be used Th...

Page 26: ...9 3 3 3 Unsupported modules The ACS does not support the WCM DIOM DIM and EIM type modules ether externally or internally 503110 Orbit ACS Manual Issue 9 26 of 63 ...

Page 27: ...9 3 4 Measure Menu Note As of firmware Version 1 49 each Channel has it s own UOM Units of Measure parameter and it is the configured string that is 503110 Orbit ACS Manual Issue 9 27 of 63 ...

Page 28: ...M configured to SysUnits which is the default setting will revert to displaying the units as indicated by the original SysUnits parameter MM Inch or Mil This facility allows for computed channels or rescaled modules to be shown with real world Units Of Measurement 503110 Orbit ACS Manual Issue 9 28 of 63 ...

Page 29: ...9 3 5 Peak Preset Limits and Misc Menu 503110 Orbit ACS Manual Issue 9 29 of 63 ...

Page 30: ...9 3 6 Output Input and Communications Menu 503110 Orbit ACS Manual Issue 9 30 of 63 ...

Page 31: ...or 4 Probe Error 1 Probe Error 1 An in line connector type probe has failed or been swapped by the wrong type Check the probe type matches the module type Correct as required Cycle power and re configure network 2 Probe Error 2 3 Probe Error 3 4 Probe Error 4 9 4 2 Detachable Probes Error Messages If a compatible probe is not fitted at startup or is dis connected during use a pop up message is dis...

Page 32: ...lidity of the reading ReadingStatus Value Displayed Value Meaning 0 OK Reading Valid 18 URangeA Under Range for Channel Module 19 ORangeA Over Range for Channel Module 246 246 Incompatible probe connected 247 247 No probe connected With the ASCII based serial communications the Limit character indicates the probe s error status 503110 Orbit ACS Manual Issue 9 32 of 63 ...

Page 33: ... with the following passwords which may be reset by the user NOTE if the password is lost forgotten there is a utility available from your supplier to reset the unit to Factory defaults level Password Description Functions 0 No password Normal Operation Access Action Screen Access MENU Read Only Operator cannot change set up configurations 1 1234 Future Options 2 2345 Future Options 3 3456 Future ...

Page 34: ...l outputs These can be connected in various ways and either powered from an internal 5V supply or an external supply The output configurations are shown below the output type is set in the Digital Output MENU 503110 Orbit ACS Manual Issue 9 34 of 63 ...

Page 35: ...rm Primary Channel Low Alarm No Alarms on Primary Channel Primary Range Error either under or over Module 1 Under Range Module 1 Over Range Secondary Channel High Alarm Secondary Channel Low Alarm No Alarms on Secondary Channel Secondary Channel Range Error either under or over Module 2 Under Range Module 2 Over Range 12 DIGITAL INPUTS 12 1 1 Digital Inputs Configuration Options The SI100 and 200 ...

Page 36: ...ions 12 1 2 Discrete Print Input The discrete print input works in the same way as the print key However the Print action is different depending if the orbit ACS is in Single Print or Continuous Print Mode 503110 Orbit ACS Manual Issue 9 36 of 63 ...

Page 37: ...Note a delay can be set between print outputs using the COMMS menu ReplyDelay 503110 Orbit ACS Manual Issue 9 37 of 63 ...

Page 38: ...this rate Averaging is applied at this rate i e 16 x averaging will complete every 4 096mS Probe Averaging 1 2 4 8 16 32 64 128 256 cycles Averaging is applied at this rate i e 16 x averaging will complete every 4 096mS Measurement Bandwidth electronics 4 8 16 32 64 128 256 512 Hz Measurement bandwidth directly related to the Probe averaging value 1 512Hz 256 4Hz Resolution 14 bits 16 bits default...

Page 39: ...14 SERIAL COMMUNICATIONS GENERAL The SI100 and SI200 has several options for Serial Communications 14 1 RS232 AND RS485 SIGNAL LEVELS 503110 Orbit ACS Manual Issue 9 39 of 63 ...

Page 40: ...omputers use a 9 way D Type which uses PIN2 Rx PIN3 Tx and Pin5 GND To connect the SI100 RS232 use the table below SI100 SI200 9 Way D Type PIN3 Tx PIN 2 Rx PIN4 Rx PIN 3 Tx PIN 2 0V PIN 5 GND 503110 Orbit ACS Manual Issue 9 40 of 63 ...

Page 41: ...24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 X m m A b s A 1 r n X X i n c h T a r e B 2 X X X m i l P r e A B A X X X X A B B X X X X X A B 2 C X X X X X X A B 2 D X X X X X X X M x A M n A M x B M n B X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Example Measurment 12 234 inches preset ...

Page 42: ...B 0 0 2 2 X X X m i l P r e A B 0 0 3 A X X X X A B 0 0 4 B X X X X X A B 2 0 0 5 C X X X X X X A B 2 0 0 6 D X X X X X X X M x A M n A 0 0 7 M x B M n B 0 0 8 X X X X X Up to X X X X X X X X X 2 5 0 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Example Measurment 12 234 inches preset applied within limits Computed Mea...

Page 43: ...ete Inputs and outputs 503110 Orbit ACS Manual Issue 9 43 of 63 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 D i n A B C D D o u t E F G r n where A B C D are logic levels for the discrete inputs 1 2 3 4 and E F G are logic levels for the discrete outputs 1 2 3 ...

Page 44: ... X X X m i l X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Example Measurment 12 234 inches preset applied within limits 1 2 2 3 4 i n c h r n READING Right aligned with DP set by precision UNITS Limits Below low limit Between low and high limit Ab...

Page 45: ...pecial case if number of DP is set to 0 There is an variation to the above i e one byte less for the reading Read Alarm limits Response to Sxx r n ASCII serial command only same packet length issue with no DPs set Sign Comma Sign Carriage Return Line Feed 0 1 2 3 5 5 6 7 8 9 10 11 12 12 13 13 13 13 13 13 13 12 13 S X X X X X X X X X X X X X X r n Unit ID READING Right aligned with DP set by precis...

Page 46: ...Measurment 12 234 inches within limits 1 2 2 3 4 i n c h n r UNITS READING Format is XXXX XXXX with leading zeros replaced by spaces Orbit ACS Implemetation of C55 The Orbit ACS emulation provides proper mm inch mil conversions The C55 always prints in mm Not supported by the emulation No None units 7 Data bits with No Parity Extras We allow the following extra Comms setup options Baud Rates 300 6...

Page 47: ...15 5 ASCII CHARACTER SET Example ASCII A is HEX 41 503110 Orbit ACS Manual Issue 9 47 of 63 ...

Page 48: ...r can read and write from the units to set parameters or read from parameters The Modbus parameter table for the device family is detailed in section 14 2 8 The SI range supports Modbus RTU and Modbus ASCII Modbus RTU uses raw binary data whereas Modbus ASCII uses the data encoded as ASCII RTU is the most widely used 16 2 OVERVIEW OF MODBUS COMMUNICATIONS 16 2 1 Modbus Master Slave The Modbus prot...

Page 49: ... be clearly detailed within the unit s documentation It is however dangerous to read the 16 bit registers that make up a more complex Parameter individually with separate message as there is no way of knowing if the data was updated in between reads resulting in a corrupted value once the complex Parameter is re constructed The SI Series of products protect against this issue and will not allow th...

Page 50: ...er Command Messages Each message the Master transmits onto the network will at least include a Node Address also often referred to as a Slave Address or ID as well as a Function Code a Parameter Address and finally a Checksum As well as these variables certain commands may also include a Parameter Count and Data Once the Master has transmitted the message it awaits a response from the relevant Sla...

Page 51: ...ct Node is responding as well as any data that was required and a calculated checksum The only type of message that doesn t solicit a response is a Broadcast type message which is not generally recommended as no confirmation of receipt type message is provided The table below describes the basic elements of a Modbus Message and what their function is Message Element Description Node Address This i...

Page 52: ...02 Read Discrete Inputs X 03 0x03 Read Holding Registers ü 04 0x04 Read Input Registers ü 05 0x05 Write Single Coil X 06 0x06 Write Single Register ü 07 0x07 Read Exception Status X 08 0x08 Diagnostics X 11 0x0B Get Comm Event Counter X 12 0x0C Get Comm Event Log X 15 0x0F Write Multiple Coils X 16 0x10 Write Multiple registers ü 17 0x11 Report Slave ID X 20 0x14 Read File Record X 21 0x15 Write F...

Page 53: ...ddress for the input value All parameter types that consume more than one 16 bit register hold their data with the most significant part first at the lower address Examples A SINT32 parameter at address 100 holds the most significant 16 bits at address 100 and the least significant 16 bits at address 101 both registers must be read together with a single multi register read command A STRING8 param...

Page 54: ... provide a floating point interface to any parameter by way of an address offset This provides an alternate address to read over Modbus providing a floating point representation of any parameter To acquire an IEEE 754 floating point value for any parameter add 8000 to the address of the parameter required and read 2 16 bit registers in a multiple register read command The data returned will be a f...

Page 55: ...re possible Equally it is of little value trying to set the display to a resolution of 0 01um if the probe cannot achieve this Averaging improves the signal to noise ratio but reduces the measurement bandwidth Generally using a higher resolution requires more averaging The averaging is expressed in terms of the number of base reading cycles for the probe where a reading cycle corresponds to 256uS ...

Page 56: ...it must be powered in the normal way as it is not powered via the USB lead The utility is part of the Orbit3 Support Pack for Windows The latest version can be downloaded from the Solartron Metrology website Once installed it is located here Follow the on screen instructions for the Updater Note After running the firmware upgrade it is advisable to power cycle the Orbit ACS to allow the changes to...

Page 57: ... all non warranty devices returned for repair Customer damage and any device found upon inspection to have no fault will be considered non warranty Please contact the Sales Office or Distributor for warranty terms service options and standard charges Adherence to these procedures will expedite handling of the returned device and will prevent unnecessary additional charges for inspection and testin...

Page 58: ...methodology the menu s should be navigated the same and the parameters adjusted in the same manner 20 2 SECTION 9 1 SI100 AND SI200 DISPLAYS As per all SI Series products the SI400 has three main screens excluding menu which provide information as described below The charts shown on any of these screens include small triangles along the bottom edge which indicate the alarm setpoints for a given ch...

Page 59: ...20 2 2 Screen 3 Screen three on the SI400 shows all four channels with a value and chart only as per below diagram 503110 Orbit ACS Manual Issue 9 59 of 63 ...

Page 60: ...all Max tracking on ALL Channels RstAllMn Reset All Min Reset all Min tracking on ALL Channels RstAMax Reset channel A Max RstAMin Reset channel A Min RstBMax Reset channel B Max RstBMin Reset channel B Min RstCMax Reset channel C Max RstCMin Reset channel C Min RstDMax Reset channel D Max RstDMin Reset channel D Min Print Print ASCII Output For protocols that support ASCII output and the Print fu...

Page 61: ... s for Peak and Preset are not included as the associated functionality is not included within the SI400 Additionally the Measurement menu page has different parameters to allow for the configuration of Value tracking or Max Min for each channel instead of the Primary Secondary computation options as per the SI100 SI200 units The Limits page also contains four sets of Hi Low alarm limits one for e...

Page 62: ...nge Module 4 Under Range Module 1 Over Range Module 2 Over Range Module 3 Over Range Module 4 Over Range 20 6 SECTION 15 1 ORBIT ACS SERIAL COMMUNICATIONS PROTOCOL The SI400 adheres to the same protocol specification as per the SI100 SI200 however further configuration is provided so any of the four channels may be outputted or ALL in which case four lines of data are outputed at a time with each ...

Page 63: ...ing the Orbit3 Support Pack for Windows software 8 23 11 15 Added Display Error messages 9 18 01 19 Added AIM LE support as well as Channel specific UOMs and individual Module Over Under Range Digital output configuration added 503110 Orbit ACS Manual Issue 9 63 of 63 ...

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