ABx Fast Protocol, Packet Size, Checksum | Escort LRP2000 manual

RFID Communications

6.5 ABx Fast Protocol

The ABx Fast protocol differs from the Abx Standard Protocol in that the atomic data element is a byte instead of a 16-bit word. ABx Fast commands and responses also contain a two-byte word to indicate the size of the packet being sent. ABx Fast also supports the use of a one-byte checksum.

Packet Size

The ABx Fast protocol requires that the size of the packet be included following the terminator in every packet. All parameters and data between the packet size byte and the checksum (if used), or terminator bytes (if not using the checksum) must be accounted for in the packet size word. The packet size will be the same with or without a checksum.

Checksum

The optional checksum must be enabled from the operating mode menu to be available. The checksum is calculated by adding all the byte values in the packet (less the values in the header, checksum if present, and terminator), discarding byte overflow, and subtracting the byte sum from FFH. Thus, when the packet length through the checksum are added as byte values, the sum will be FFH.

Example

The following is a typical command using a checksum.

Field	Contents
Header	0202H

Command Size	0003H

Command Code	01H

Timeout	07D0H

Checksum	24H

Terminator	03H

LRP2000 Passive Reader/Writer

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Escort LRP2000 manual ABx Fast Protocol, Packet Size, Checksum, Field Contents

Contents

LRP2000 Passive Reader/Writer Escort Memory Systems Warranty Table of Contents Rfid Communications Iii Unpacking and Inspection Introduction FCC Compliance FCC Certifications Introduction CE Certification CE Statement Changes and Modifications LRP2000 Dimensions Dimensions LRP2000 Mounting Hole Locations and Dimensions LRP2000-23 Antenna Dimensions LRP2000-26 Antenna Dimensions Antenna Environment Installation1 LRP2000-26 Antenna Assembly Installing the Antenna Green Orientation Dots Location Green Dots Joining Plate Connectors Joining Plate Joining Plate and Fasteners Completed LRP2000-26 Antenna RF Connectors and Strain Relief Connectors and Wiring Internal Connectors Terminal Blocks Antenna Cabling Antenna Connectors Single Antenna System Connections Connecting Single Antenna System Dual Antenna System Connections Connecting a Dual Antenna System RS232 Pinouts, J8 Terminal Block J8 Pin Number Interface J8 Signal Name DB9 Pin DB25 PinData Terminal Blocks J10 COM1 RS422 Power Supply LRP2000 Wire color Connector Pin Number Power Supply WiringInput Power Pinout J10 Pin Number Signal Name Polarity Description Input Power Supply Lugs Ethernet Wiring RS232 Wiring RS422 Wiring and Termination Digital I/O Circuitry Inputs Connector Pin Signal Name Polarity Number Outputs Terminal Signal Name Polarity Number Input from Sourcing Contact Input from NPN Sensor Sourcing Output Contact Sinking Output LED Driver J32 J34 Master/Slave ConfigurationSetting Jumper 32 on the Master OFF DIP Switch Settings on the SlaveMaster DIP Switch Settings Bank Position Slave DIP Switch Settings Setting Jumper J16 on the Slave 2 COM2 Configuring the Serial InterfaceCOM1 Defaults 1 COM1 Baud Rate 1200, 2400 9600, 19200 bps COM2 DefaultsCOM2 Parameters Settings Digital Board DIP SwitchDip Switch Settings Download Baud Rate Interface Restore Defaults Ignored Configuring the Ethernet Module for Network CommunicationDefault IP Address Optional Ethernet Interface Menu Loading Configuration Server Properties LED Indicators Color Meaning Error and Config LEDs 4 Alternating Flashes Flashing LED SignalsError LED 4 Flashes Error and Config LEDs 4 Simultaneous Flashes Faulty Network Connection No Dhcp Response Received LRP2000 Standard PC Serial Port How to Enter the Menu Configuration Set COM2 Parameters Set-Up Operating ParametersSet COM1 Parameters Framing Editing Set Operating ModeOperating Mode Checksum? 0 Disabled 1 Enabled Length Power up in Continuous Read Mode?Delay Between Identical Decodes Start Address Return to Main Menu Restore Factory DefaultsSet RF Communication Downloading DSP Firmware Download New Program Exit to Operating Mode Conventions Command protocols User I/O Commands ABx Command Set ListingsSingle Tag Commands Multi-tag Commands Multi-tag Command Parameters Command Parameters Start Continuous Read Multi-tag Example Field Number Content BytesStandard ABx Protocol Single Tag Example Field Remarks ABxS Command 04H Fill TagCommand from Host Example Response from Controller ABxS Command 05H Read ABxS Command 06H Write E0H ABxS Command 07H Read Tag Serial NumberACH ABxS Command 0DH Stop/Start Continuous Read ABxS Command 08H Tag Search ANT Config BlinkCommand Response Field Remarks Behavior Description Response from controller ABxS Command 14H Get Memory StatusField Content Description ABxS Command 16H Write Family CodeABxS Command 17H Lock Family Code ABxS Command 82H SN Read All AAH FFH 6CH 0BH ABxS Command 83H Start/Stop Continuous SN Read All1EH FCH 4BHC5H Response to a successful command follows this form ABxS Command 84H Fill Tag All ABxS Command 85H Read All Termination Packet ABxS Command 86H Write All D2H ABxS Command 87H Read Tag SN All6EH 3CH ABxS Command 88H Tag Search All AAH 8BH ABxS Command 8BH Write Family Code All AAH 8CH ABxS Command 8CH Lock Family Code All AAH 8DH ABxS Command 8DH Start/Stop Continuous Read All Data response from controller Command is formatted as shown below ABxS Command 91H Memory Lock All ABxS Command 94H SN Fill 00H 01H SN byte F3H ABxS Command 95H SN ReadABH ABxS Command 96H SN Write A4H 0EH ABxS Command 10H Set OutputRemarks LSB Bit Output D Output C Output B Output a 0CH Remarks LSB Bit Input D Input C Input B Input a ABxS Command 11H Input Status Checksum Field ContentsABx Fast Protocol Packet Size ABx Fast Multi-tag Command Structure ABx Fast Single Tag Command Structure Header 0202H Command Size ABxF Command 04H Fill Tag AEH ABxF Command 05H ReadCommand from Host Field Content Response from Controller Field Content E7H ABxF Command 06H Write F8H ABxF Command 07H Read Tag Serial NumberEEH A3H ABxF Command 08H Tag SearchF2H F6H ABxF Command 0DH Start/Stop Continuous Read1DH F1H ABxF Command 14H Get Memory StatusE1H E8H ABxF Command 16H Write Family CodeE5H ABxF Command 82H Read Data and SN All ABxF Command 17H Lock Family Code A6H 101 6FH Command from Host Response from Controller Field Content 103 ABxF Command 83H Start/Stop Continuous SN Read All 7BH 6AH 105 106 ABxF Command 84H Fill All 107 ABxF Command 85H Block Read All C8H EBH 109 ABxF Command 86H Block Write All 110 ABxF Command 87H Read Tag SN All F4H 9BH ETX ABxF Command 88H Tag Search All 113 ABxF Command 8DH Stop/Start Continuous Read All 114 ABxF Command 91H Memory Lock All 115 ABxF Command 8BH Write Family Code All F7H ABxF Command 8CH Lock Family Code All 117 ABxF Command 94H SN FillResponse form Controller Field Content 9DH B0H 119 ABxF Command 95H SN Block Read 120 121 ABxF Command 96H SN Block Write 4DH Output D Output C Output B Output a Byte ABxF Command 10H Set Output123 Output LSB Bit Status 124 ABxF Command 11H Input Status EAH 125EDH ABx Ascii Protocol Response Structure ABx Ascii Protocol Command StructureCommand Packet Structure ABx Ascii Protocol 127 Command/Response SizeExample Ascii Command, Fill Tag Response from Controller Field Ascii Hex Ascii String Value Command from Host Field Ascii Hex Ascii String ValueSTX Error Code Description ABx Error CodesMulti-tag Error Codes ABx Standard Error Codes Field Number of Ascii Contents Characters ABx Fast Error CodesABx Ascii Error Codes Field Bytes Contents 131 Multi-tag Command Error Code Environmental Mechanical SpecificationsElectrical Communication Tags AccessoriesAvailable Models Options Decimal Hex Character 134 DEL 135