Trovan GR-250 Hand Held Reader Computer Interface Manual
Contents
1. TNO lt ct gt Date and time successfully saved Note No checking is performed to ensure a valid date time has been set Illegal character in data 16 U S Patents 5 012 236 5 095 309 and 5 198 807 061605 V lt cr gt Read the reader software version tttttttttttttttt VOK lt cr gt tttttttttttttttt 16 character ASCII message containing the software version U S Patents 5 012 236 5 095 309 and 5 198 807 061605 47 Xtttttttttttttttt lt cr gt Display the 16 character ASCII message tttttttttttttttt on the first line of the reader s LCD XOK lt cr gt Reader displays all 16 characters or stops if a lt cr gt is encountered in the string Ytttttttttttttttt lt cr gt Display the 16 character ASCII message tttttttttttttttt on the second line of the reader s LCD YOK lt cr gt Reader displays all 16 characters or stops if a lt ct gt is encountered in the string Zaa lt cr gt Illuminate the teader s LEDs and or emit tone from speaker where aa Hex value xxssxxer in binary x Don t cate g Green LED rt Red LED ss 00 gt Do not emit a tone ss 01 gt Emit KEY tone ss 10 gt Emit OK tone ss 11 gt Emit NO tone ZOK lt cr gt ot ZNO lt ct gt Command received and executed Illegal character aa 18 U S Patents 5 012 236 5 095 309 and 5 198 807 0612. lt nul gt NO lt cr gt Note lt nul gt 00h Invalid character or unrecognized command 6 U S Patents 5 012 236 5 095 309 and 5 198 807 061605 AA lt ctr gt Display current The reader will send On line settings the values of the communication parameters AB lt cr gt Display BAUD nnAOK lt cr gt nn BAUD rate a 03 300 BAUD 12 1200 24 2400 48 4800 96 9600 19 19200 ABnn lt cr gt Set BAUD rate AOK lt cr gt BAUD rate an BAUD rate successfully changed 03 300 BAUD 12 1200 24 2400 48 4800 96 9600 19 19200 U S Patents 5 012 236 5 095 309 and 5 198 807 061605 7 Al lt cr gt Display state of nAOK lt cr gt n 0 gt Off No Decode n 1 gt On Message Enable parameter Aln lt cr gt Set No Decode AOK lt cr gt Parameter n 0 gt Of Message Enable successfully changed ei On parameter AP lt cr gt Display Prefix aabb AOK lt cr gt aabb String of Prefix characters APaabb lt cr gt Set Prefix AOK lt cr gt Prefix successfully aabb where aa changed Note Prefix value is is a 2 digit hex or stored in dynamic code for the RAM amp will get character to be ANO lt cr gt Illegal character s in reset to default value included in the string of Null 00 Prefix string whenever Reader is max of 32 powered on characters AS lt cr gt Display Suffix aabb AOK lt c
3. n ELECTRONIC IDENTIFICATION SYSTEMS GR 250 Computer Interface Manual Introduction The GR 250 Hand Held Reader is designed to read Trovan RFID radio frequency identification transponders Details of reader operation can be found in the Trovan GR 250 Hand Held Reader User Manual Advanced Reader Functions The GR 250 Hand Held Reader is capable of communicating with an external computer via its RS 232 interface This interface allows the external computer to transfer transponder ID numbers to and from the reader as well as control reader parameters The reader is capable of four modes of operation These modes allow the operator to store transponder readings in the reader s internal flash memory as well as compare the ID number with others previously stored This comparison feature provides a means to signal the operator when one or more desired transponders have been located within a larger group As an added feature the transponder readings are date and time stamped at the instant of reading and this information is stored along with the ID number in the reader s memory Up to 3 072 transponder ID number readings automatically stamped with date and time can be stored in the reader s flash memory Readings can be stored into one or mote of 254 discrete subsets called Lots The following parameters can be set via the RS 232 interface e Date time and day of the week e Communications parameters BAUD rate e
4. the On line command set is enabled At this time no On line commands are defined so this should be set to Off A host computer actuated read is an example of a reader operation which could be initiated in the On line mode by such a command Such a host computer actuated read currently may be performed by using either the G command or T command in the Trovan command set No Decode Message Enable On Off When set On a user defined string of characters will be sent according to the current handshaking protocol after each unsuccessful read attempt The Prefix Suffix and Check Digit are not sent after an unsuccessful read attempt when the No Decode Message Enable On Scan amp Store Enable On Off When set On the reader will save the transponder ID numbers in the Scan amp Store buffer This buffer is capable of storing up to 758 readings If ENQ is Off the reader will also immediately sent out the ID number of the transponder just read according to the current handshaking protocol If ENQ is On nothing is sent by the reader until lt ENQ gt is sent by the host computer When the reader recetves the lt ENQ gt character it will send out one ID number from the Scan amp Store buffer along with any Prefix Suffix and Checksum If the host computer acknowledges receipt 20 U S Patents 5 012 236 5 095 309 and 5 198 807 061605 of the data according to the current handshaking protocol that data will be erased from
5. L lt cr gt Read the current nnLOK lt cr gt nn Lot 01H gt Lot setting FEH Lon lt cr gt Set the current LOK lt cr gt Setting was changed Lot nn i to nn nn Lot number n 01h gt FED Note Lot LNO lt cr gt Lot Keylot number cannot or illegal character in Kevlot nn number M lt cr gt Read the current nnMOK lt cr gt nn XY Mode settings X 0 gt Seek mode is not set X 1 gt Seek mode is set Y 0 gt Save mode is not set Y 1 gt Save mode is set Mnn lt cr gt Set the current MOK lt cr gt Settings were Mode settings changed nn XY Si X 0 gt Clear MNO lt cr gt Illegal character in nn Seek mode X 1 gt Set Seek mode Y 0 gt Clear Save mode Y 1 gt Set Save mode N lt cr gt Dump the nneeddcchbaayyo nn Lot number contents of all ottgghhmmssuu0 ce Byte 5 most U S Patents 5 012 236 5 095 309 and 5 198 807 061605 13 Lots in reader 000 lt cr gt significant 2 hex memory The digits of ID code ID code is sent dd Byte 4 of ID with the most Code significant 2 gt ESCE Ti Byte 3 of ID digits first and tt the least bb Byte 2 of ID significant 2 code hexadecimal aa Byte 1 least digits last significant 2 hex digits of ID code Note This yy Year in decimal command is the eg 05 same as the D i command except CE that the ID code i oa is sent with the most significant tt Date in de
6. code decimal 01 gt is sent with the 12 least significant tt Date in decimal digits first rather 01 gt 317 than the mose gg Day in decimal significant digits 01 gt 07 01 Monday 40 U S Patents 5 012 236 5 095 309 and 5 198 807 061605 first hh Hours in decimal 00 gt 2230 mm Minutes in decimal 00 gt 597 ss Seconds in decimal 00 gt 5027 uu Hundredths of seconds in decimal 007 gt 997 t 0000 0000h DOK lt cr gt No readings in memory Dnn lt cr gt Dump the nnaabbccddeeyyo Data fields are the _ contents of Lot ottgghhmmssuu0 same as for the D nn Lot number number nn The 000 lt cr gt command 00h gt FEh ID code is sent with the least OF significant 2 DOK lt cr gt No readings in the hexadecimal Lot specified digits first and the most significant 2 hexadecimal digits last F lt cr gt Read the number nnnnFOK lt cr gt nnnn Number of of free positions free memory in Lot memory positions G lt cr gt Read a aabbbcccdddeeG aa Byte 1 least transponder OK lt cr gt significant 2 hex digits of ID code Note This bb Byte 2 of ID command is the same as the T command except that the ID code is sent with the code cc Byte 3 of ID code dd Byte 4 of ID U S Patents 5 012 236 5 095 309 and 5 198 807 061605 11 l
7. lt cr gt Display state of nAOK lt cr gt n 0 gt Off Scan amp Store n 1 gt On Enable parameter AHn lt cr gt Set Scan amp Store AOK lt cr gt Parameter ita Enable successfully changed a si parameter 8 U S Patents 5 012 236 5 095 309 and 5 198 807 061605 U S Patents 5 012 236 5 095 309 and 5 198 807 061605 9 ANO lt cr gt Illegal character s in string AXaabb lt cr gt Set No Decode AOK lt cr gt No Decode String String aabb successfully changed Note No Decode where aa is a 2 String value is stored digit hex code in dynamic RAM amp for the character will get reset to to be included in default value of the No Decode Null whenever String max of Reader is powered 32 characters on C lt cr gt Clear all Lots in COK lt cr gt Lot memory cleared reader EON Note It takes 30 40 seconds to clear Lot memory D lt cr gt Dump the nnaabbccddeeyyo nn Lot number contents of all ottgghhmmssuu0 aa Byte 1 least Lots in reader 000 lt cr gt significant 2 hex ie The digits of ID code code is sent she bb Byte 2 of ID DES code significant 2 hexadecimal cc Byte 3 of ID digits first and code the most dd Byte 4 of ID significant 2 Code hexadecimal ee Byte 5 most digits last significant 2 hex digits of ID code Note ge yy Year in decimal command is the pate same as the N 667053 command except 00 Month in that the ID
8. the reader transmits the ID number to the host computer An lt ACK gt sent by the host computer indicates that the host computer has acknowledged receipt of the data A lt NAK gt sent by the host computer indicates a problem with the transmission and the reader will retransmit the data If no lt ACK gt or lt NAK gt is received from the host computer within approximately 10 seconds the reader will also retransmit the data An error message Communications Error will be displayed on the readers LCD after three unsuccessful transmission attempts U S Patents 5 012 236 5 095 309 and 5 198 807 061605 19 ENQ Software Handshaking Enable On Off When ENQ is On the reader will wait for the host computer to send an lt ENQ gt character 05h before sending any data If lt ENQ gt is not received within approximately 10 seconds an error message Communications Error will be displayed on the reader s LCD If both the ENQ and the Scan amp Store modes are enabled only data stored in the Scan amp Store buffer will be sent In this situation the 10 second timeout is disabled thereby allowing the host computer to request the transmission of stored data at any time Check Digit Enable On Off If On a 2 digit ASCII hexadecimal check digit will be appended to the ID code The check digit is the modulo 256 sum of the ASCII code and does not include the Prefix or Suffix Bidirectional Enable On Off When set On
9. will stay powered on for approximately 30 seconds after DSR DTR goes low RS 232 Command Summary Trovan mode only lt esc gt MODECHA Set reader into None Reader is set into NGEO Trovan mode Trovan mode LCD displays Note lt esc gt COMMAND SET the Escape CHGE character 1Bh ACTIVE SET 0 for 5 seconds lt esc gt MODECHA Set reader into None Reader is set into NGE1 On line mode On line mode LCD displays Note lt esc gt COMMAND SET the Escape CHGE character 1Bh ACTIVE SET 1 for 5 seconds Command Response lt cr gt Null command Host software should issue this command until the OK response is received to insure proper initialization of the reader s RS 232 serial port lt nul gt OK lt cr gt lt nul gt Note lt nul gt 00h Communication has been established Communication has NOT been established Note The family of A commands is used for setup of the On line communication parameters Except for Abnn which sets the BAUD rate these communication parameters are valid ONLY when the reader has been set into the On line mode using the lt esc gt MODECHANGE1 command xx lt cr gt If an invalid character ot unrecognized command is sent the reader will respond with a NO response xx is any invalid command This response may also be sent the first time communication is attempted
10. 605 On line Mode Operation The On line mode emulates the protocol available in many data collection devices The reader can send transponder ID numbers to the host computer as the transponder is scanned or save it in a buffer for later retrieval The BAUD rate Prefix Suffix and handshaking protocols are user defined and are set using the RS 232 Commands while in the Trovan mode The reader is wited as DCE so it looks like a modem to the host computer In all modes the RS 232 interface is configured with 8 data bits 1 stop bit and no parity The default BAUD rate is 9600 BAUD The reader follows Xon Xoff protocol where data transmission is suspended after receipt of Xoff S and resumes after reception of Xon CQ Conversely if the host computer receives Xoff it should suspend data transmission until after receipt of Xon BAUD Rate Settable to 300 1200 2400 4800 9600 or 19200 BAUD The BAUD rate setting applies to both the Trovan and On line modes After the BAUD rate setting is altered the new BAUD setting will not take effect until the reader s RS 232 interface is reinitialized by removing and then reconnecting the interface cable or having the host computer drop and then reassert DTR The following parameters apply only in the On line mode ACK NAK Software Handshaking Enable On Off If ACK NAK is On the reader will look for either lt ACK gt 06h or lt NAK gt 15h to be sent by the host computer after
11. 89A Lot 238 DUPE When the trigger is released the reader displays the mode it is in SAVE the current Lot SAVE number e g 238 and the number of readings _Lot 238 FRE 3061 that can still be stored in the reader s memory e g FRE 3061 When the reader s memory is full the LCD will display a MEMORY FULL message MEMORY FULL Save No Seek Yes In this mode the reader compares each ID number being read with all of the ID numbers previously stored in a particular Keylot If the pny 12 3456 789A ID number matches any of the ID numbers in MATCH U S Patents 5 012 236 5 095 309 and 5 198 807 061605 3 the Keylot the reader s LCD indicates a match ID 12 3456 789A If the ID number does not match any of the ID NO MATCH numbers in the Keylot the readers LCD indicates no match was made When the trigger is released the reader displays Keylot 002 the current Keylot number e g 002 Save Yes Seek Yes This mode is identical to Save No Seek Yes READING 1564 except that any matching ID numbers found in S_07 25 05 13 47 the Keylot are stored in the Lot ID 12 3456 789A Lot 238 MATCH ID 12 3456 789A Any ID numbers that do not match the Lot 238 NO MATCH contents of the Keylot are displayed but not stored If the ID number is already present in the ID 12 3456 789A current Lot the reading is not stored and the Lot 238 DUPE operator is notified that a duplicate readin
12. cimal digits first tather 01 gt 31 than the least gg Day in decimal significant digits 01 gt 07 01 first Monday hh Hours in decimal 00 gt 23 mm Minutes in decimal 00 gt 597 ss Seconds in decimal 00 gt 597 uu Hundredths of seconds in decimal 00 gt 997 ot 0000 0000h NOK lt cr gt No teadings in memory Nan lt cr gt Dump the nneeddccbbaayyo Data fields are the contents of Lot ottgghhmmssuu0 same as for the N nn Lot number number nn The 00h gt FED ID code is sent 000 lt cr gt command with the most significant 2 lt a hexadecimal NOK lt cr gt No readings in the digits first and Lot specified the least significant 2 hexadecimal digits last P lt cr gt Read the trigger dPOK lt cr gt d 0 gt Trigger is not depressed d 1 gt Trigger is depressed Snnaabbccddeeyyoo Save the data to SOK lt cr gt Data were tteghhmmssuu0000 Lot memory successfully saved in lt cr gt where ot Lot memorv nn Lot SNO lt cr gt Unsuccessful Either number 01 FE aa Byte 1 least significant 2 hex digits of ID code bb Byte 2 of ID code cc Byte 3 of ID code dd Byte 4 of ID Code ee Byte 5 most significant 2 hex digits of ID code yy Year in decimal e g 057 oo Month in decimal 01 gt 127 Lot memory is full or the Lot Number nn 00 or an i
13. east significant Code digits first tather ee Byte 5 most than the most significant 2 hex significant digits digits of ID code first ot GNO lt cr gt No valid ID code was detected I lt cr gt Read a eeddccbbaalOK ee Byte 5 most transponder lt cr gt significant 2 hex digits of ID code Note This dd Byte 4 of ID command is the Code eo cc Byte 3 of ID command except VE that the ID code is sent with the bb Byte 2 of ID most significant code digits first rather aa Byte 1 least than the least significant 2 hex significant digits digits of ID code first ot INO lt cr gt No valid ID code was detected J lt cr gt Read the nJOK lt cr gt n 0 gt Display ID H Hex Decimal as 10 hexadecimal display setting digits n 1 gt Display ID H as 12 decimal digits Jn lt cr gt Set the JOK lt cr gt Setting was changed Hex Decimal to n n 0 gt Display ID di or splav setting as 10 hexadecimal digits JNO lt cr gt Setting was not a changed due to illegal n 1 gt Display ID character in n as 12 decimal digits K lt cr gt Read the current nnKOK lt cr gt nn Keylot 01H Keylot setting gt FEH 12 U S Patents 5 012 236 5 095 309 and 5 198 807 061605 Knn lt cr gt Set the current KOK lt cr gt Setting was changed Keylot nn to nn nn Lot number gt 01h gt FED Note Keylot KNO lt cr gt Keylot Lot number cannot or illegal character in Lot number nn
14. g has occurred Keylot 002 SAVE When the trigger is released the reader displays Lot 238 FRE 1508 the current Keylot number e g 002 the mode it is in SAVE the current Lot number e g 238 and the number of readings that can still be stored in the reader s memory e g FRE 1508 When the reader s memory is full the LCD will display a MEMORY FULL message MEMORY FULL The default Lot number is 1 and the default Kevlot number is 2 Note The Lot number must always be different from the Keylot number Communicating with the GR 250 Reader The GR 250 Hand Held Reader can communicate with a computer via its RS 232 interface The interface cable must have a Conxall Mini Con X 4 U S Patents 5 012 236 5 095 309 and 5 198 807 061605 the reader toa computer via the RS 232 interface Or you can fabricate your own interface cable 6282 8SG 311 8 pin socket connector on one end to mate with the reader s connector The other end must have a 9 pin D connector for connecting to a computer The signal pin out connections are as follows Reader s 8 pin Socket Connector Computer s 9 pin D Connector Pin7 TXD Pin 2 RXD Pin 6 RXD Pin3 TXD Pin5 DIR Pin 4 DSR Pin 4 Ground Pin 5 Ground Note An optional The reader is switchable between two basic interface cable must be Modes Trovan mode amp On line mode The purchased to connect mode may be changed by sending the 12 character string lt esc gt MODECHANGEx whe
15. he Suffix can be from 0 to 31 characters long The Suffix is sent with every ID code immediately folowing the ID number or the Checkdigit if the Checkdigit Enable is set to On The default value is ODh carriage return No Decode String A user defined string that can contain any character except the null 00h character which is used as the terminating character The No Decode String can be from 0 to 31 characters long The No Decode String is sent whenever an unsuccessful read attempt is made The Prefix and Suffix are not sent The default value is 00h null character Note Prefix Suffix amp No Decode String are stored in dynamic RAM and will get reset to their default values whenever the reader is powered on U S Patents 5 012 236 5 095 309 and 5 198 807 061605 21 Troubleshooting The Reader Doesn t Read Symptoms When the trigger is depressed the red and green LEDs do not illuminate and the LCD is blank There is no response from the reader Response The battery voltage is low Recharge the battery If there is still no response after recharging the battery the battery needs to be replaced with a fully charged 12 volt NiMH battery Do NOT replace the 12 volt battery with a 9 volt battery even though the battery connectors are the same the reader will not operate with a 9 volt battery The Reader Doesn t Communicate with My Computer Symptoms My computer software program doesn t appear to communicate with
16. nvalid character was entered 14 U S Patents 5 012 236 5 095 309 and 5 198 807 061605 U S Patents 5 012 236 5 095 309 and 5 198 807 061605 15 tt Date in decimal 01 gt 317 ge Day in decimal 01 gt 07 01 Monday hh Hours in decimal 00 gt 237 mm Minutes in decimal 007 gt 597 ss Seconds in decimal 00 gt 597 uu Hundredths of seconds in decimal 00 gt 995 592 uu Hundredths of seconds in decimal 00 es 99 0000 0000h T lt cr gt Read date and yyootteghhmmss yy Year in decimal time uu lt cr gt e g 057 oo Month in decimal 01 gt 12 tt Date in decimal 01 gt 1313 gg Day in decimal 01 lt gt 07 01 Monday hh Hours in decimal 00 gt 23 mm Minutes in decimal 00 gt 597 ss Seconds in decimal 00 gt Tyyootteghhmmssu u lt cr gt Set date and time where yy Year in decimal e g 057 oo Month in decimal 01 gt 12 tt Date in decimal 01 gt 317 ge Day in decimal 01 gt 07 01 Monday hh Hours in decimal 00 gt 27 i mm Minutes in decimal 00 gt 597 ss Seconds in decimal 00 gt 597 uu Hundredths of seconds in decimal 00 gt 99 TOK lt cr gt or
17. r gt aabb String of Suffix characters Note Default value OD i e carriage return ASaabb lt ct gt Set Suffix AOK lt cr gt Suffix successfully aabb where aa changed Note Suffix value is is a 2 digit hex ot stored in dvnamic code for the RAM amp will get character to be ANO lt cr gt Illegal character s in reset to default value included in the string of Cartiage Suffix string Return 0D max of 32 whenever Reader is characters powered on AX lt cr gt Display No aabb AOK lt cr gt aabb String of Decode String No Decode String or characters AC lt cr gt Display state of nAOK lt cr gt n 0 gt Off Check Digit n 1 gt On Enable parameter ACn lt cr gt Set Check Digit AOK lt cr gt Parameter Sri Enable successfully changed a i 2 parameter AE lt cr gt Display state of nAOK lt cr gt n 0 gt Off ENQ Enable n 1 gt On parameter AEn lt cr gt Set ENQ Enable AOK lt cr gt Parameter n 0 gt Of parameter successfully changed n 1 gt On AF lt cr gt Display state of nAOK lt cr gt n 0 gt Off ACK NAK n 1 gt On Enable parameter AFn lt cr gt Set ACK NAK AOK lt cr gt Parameter CETTE Enable successfully changed fe Bs aa parameter AG lt cr gt Display state of nAOK lt cr gt n 0 gt Off Bidirectional n 1 gt On Enable parameter AGn lt cr gt Set Bidirectional AOK lt cr gt Parameter E Enable successfully changed a parameter AH
18. re x 0 gt Trovan mode and x 1 gt On line mode The Trovan mode will be selected if x is set to some other number than 0 or 1 lt esc gt is the Escape character 1Bh The default mode is Trovan Trovan Mode Operation The Trovan mode permits the user to define the operation of the reader Setting the internal clock communication parameters and memory storage modes are all performed in the Trovan mode using the RS 232 Commands A communications program such as Hyper Terminal or Procomm can be used to send commands to the reader These commands are in the form of ASCII characters The reader will respond using ASCII characters Valid commands are described in the RS 232 Command Summary The default interface parameters are 9600 BAUD 8 data bits 1 stop bit and no parity 9600 8 N 1 The reader follows Xon Xoff protocol Receipt of S Xoff suspends data communications and Q Xon restarts communications Notes e All commands sent to the reader MUST be capital letters U S Patents 5 012 236 5 095 309 and 5 198 807 061605 5 e These commands are available only when the GR 250 reader is set into the Trovan mode vs On line mode which is the default mode e All data are transmitted in ASCII hexadecimal form i e 00 through FF unless otherwise noted e lt cr gt Carriage Return e The GR 250 reader gets powered on whenever the computer asserts i e positive voltage the DSR DTR signal amp
19. st be returned for repair vat The reader has experienced an error while kk Eror communicating with the computer Make sure the RS 232 interface cable is properly connected and the computer and reader communications parameters are set propetly Transmitter The reader has experienced a hardware fault and Fault gt SERVICE must be returned for repair Low Battery The battery voltage is down to approximately Please RECHARGE 11 8 volts and must be recharged or replaced immediately The reader will not function until the battery is either recharged or replaced with a fully charged battery The real time clock RTC lithium battery voltage is down to approximately 2 5 volts and must be replaced in order to operate the reader in either the Seek and or Save modes and to maintain an accurate date and time The reader must be returned for repair to replace the lithium battery If the RTC lithium battery is not replaced unpredictable reader operation may occur in the Seek and or Save modes the dates and times of transponder readings stored in Lot memory may be inaccurate and communications parameters such as BAUD rate may be unpredictable SERVICE Replace Lithium Battery U S Patents 5 012 236 5 095 309 and 5 198 807 061605 23
20. tc e Hexadecimal or decimal display mode e Save and Seek modes If Save is selected the operator selects a Lot number 1 254 to which readings will be saved If Seek is selected the operator selects a Keylot number 1 254 whose existing contents will be compared to new readings A Keylot is a Lot in which ID numbers have previously been stored 2 U S Patents 5 012 236 5 095 309 and 5 198 807 061605 Save directs the reader to store the transponder ID numbers in its memory in a previously specified Lot Seek directs the reader to compare the transponder ID number being read to those previously stored in a Keylot The Save and Seek modes define four modes of reader operation Save No Seek No This is the normal default mode of operation of the reader In this mode the reader displays the transponder ID number on its LCD The ID numbers are not stored in the reader s memory When the trigger is released the reader displays the transponder ID number for approximately ee ees 30 seconds Save Yes Seek No In this mode the reader displays the READING 0012 transponder ID number on its LCD and also S 07 25 05 13 47 stores it along with the current Lot number ID 12 3456 789A Weekday Date amp Time in the reader s memory 1 014238 SAVED If the ID number is already present in that Lot the reading is NOT stored and the operator is notified that a duplicate reading has occurred ID 12 3456 7
21. the buffer If the protocol is such that the host computer is not required to acknowledge receipt of the data i e ACK NAK is Off the data will be erased automatically from the buffer after transmission The data are sent out on a first in last out basis If the buffer is empty the reader will send lt ACK gt in response to the host computers lt ENQ gt character The receipt of this lt ACK gt character must be acknowledged by the host computer according to the current protocol No command is provided to clear the Scan amp Store buffer so the buffer can only be emptied by sending the reader lt ENQ gt characters until the reader responds with lt ACK gt If the Scan amp Store Enable is switched to Off and or the reader is switched to the Trovan mode the contents of the Scan amp Store buffer will remain intact but no new scanned ID numbers will be saved in the buffer until the Scan amp Store is re enabled and the On line mode is again selected The following three strings are user definable Prefix A user defined string that can contain any character except the null 00h character which is used as the terminating character The Prefix can be from 0 to 31 characters long The Prefix is sent with every ID code immediately preceding the ID number The default value is 00h null character Suffix A user defined string that can contain any character except the null 00h character which is used as the terminating character T
22. the readet Response Make sure you are using the correct RS 232 interface cable Make sure the cable is well mated to your computer s communications port i e it doesn t wobble and to the reader The readers mating connector is keyed and can only be attached in the correct keyed position Make sure the connector is making good contact by tightening the connectors slip ring Make sure your computer is running a communications program such as Hyper Terminal or Procomm or a Trovan GR 250 compatible applications software program Make sure your communications program has its communications parameters set to 9600 N 8 1 If you have previously changed the reader s BAUD rate to something other than 9600 make sure your communications program is using the correct BAUD rate 22 U S Patents 5 012 236 5 095 309 and 5 198 807 061605 The Reader Displays an Error Message on the LCD The following is a list of error messages that may be displayed on the reader s LCD along with possible causes and remedies When saving transponder ID numbers to the readers memory in the SAVE mode the LCD will display a MEMORY FULL message when the memory becomes full Either clear memory using the C command ot switch out of the SAVE mode MEMORY FULL Flash Write There has been an error when trying La save a Error transponder ID number to the readers flash memory Try reading the transponder again If the error recurs the reader mu
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