EZP-250 User's Manual
Contents
1. 1 Command without option Command 2byte Command with option Command 2byte Option n byte If a command is defined without option the current value is to be displayed Example BR FE lt CR gt Set baud rate to the FE value 1700 lt CR gt lt LF gt Command OK IBR lt CR gt Confirm the baud rate value IFE lt CR gt lt LF gt Display baud rate 1700 lt CR gt lt LF gt Command OK 2 2 3 Response Code Format As shown below response messages of EZP 250 are displayed in two formats depending on their options Response message without option Message string 3byte Response message with option Message string 3byte option n byte The response codes for commands are given as follows Code Option strings when VI Description command 1900 COMMAND STATE EZP 250 is ready to receive commands COMMAND OK Command OK PPP UP PPP connected TCP CONNECTED TCP connected 12 UDP SENT UDP data sent ICMP RCVD Response to the ICMP echo request has been received Invalid command EZP 250 is in the bad state 0 PPP connection fail or PPP closed TCP connection fail or TCP closed UDP TIMEOUT EZP 250 didn t received during the given 7 7 0 0 0 3 4 80 2 3 4 0 1 oo oo 8 8 timeout ICMP TIMEOUT Fail in receiving response to ICMP echo request 0 0 0 8 2 3 EZP 250 Commands 2 3 1 BR Baud Rate of MT2 This command is used to change2. 710 lt CR gt lt LF gt IUS 5 100 lt CR gt 5 bytes data gt 1730 lt CR gt lt LF gt lt 3 bytes data gt IDN lt CR gt 1810 lt CR gt lt LF gt NO CARRIER lt CR gt lt LF gt Set server IP Command OK Set server port Command OK Set UDP local port Command OK Set modem Transferred to MT2 Command OK Data transferred from MT2 Dialing Transmitted to MT2 Call connected Data transferred from MT2 PPP connect command PPP connection success UDP data send command 5 bytes transmitted within 1 sec UDP transmission completed UDP data received through port 2000 PPP down command PPP down Call release Data transferred from MT2 27 4 Customer Service Warranty and Notes on Operation 4 Customer Service If you have any questions regarding operation of your product visit the Customer Service FAQ page on Sollae System s website or send us mail at the following address Website address for customer service http www sollae co kr Email address support sollae co kr 4 2 Warranty 4 2 Refund You will be refunded if you decide to return your product within 2 weeks after purchasing 4 2 2 No charge A S If there are any defects found in your product within one year after purchasing repairing and exchange will be provided free of charge However if the product failure is due to user s fault repair service will be charged or the product will be replaced at user s expense 4 2 3 Cha
3. Communication D Description Phase Before PPP Before PPP connect command UP all data except for the EZP 250 connect commands are transmitted to the opposite serial port For example the command data transferred from TE2 is transmitted to MT2 and vice versa After PPP If the PPP connect command is received TE2 handles only EZP 250 23 connect command TCP connected commands and ignores others MT2 recognizes only the HDLC data format for PPP data processing After PPP has been connected UDP data can be transmitted or received and TCP connection is allowed While TCP is connected all data received from TE2 is processed by TCP IP PPP and transmitted to MT2 In addition the TCP IP PPP data received from MT2 is processed and the resulting raw data is transferred to TE2 To close TCP connection the external host has to close the connection or TE2 has to send three lt ESC gt characters At this time the three lt ESC gt characters are transferred to the host connected 24 3 Operation Examples 3 1 Changing setting values 1001 lt CR gt lt LF gt 1900 lt CR gt lt LF gt IBR FE lt CR gt 1700 lt CR gt lt LF gt IBR lt CR gt IFE lt CR gt lt LF gt 1700 lt CR gt lt LF gt IEC 23 lt CR gt 700 lt CR gt lt LF gt ID eztcp lt CR gt 700 lt CR gt lt LF gt ID lt CR gt eztcp lt CR gt lt LF gt 700 lt CR gt lt LF gt PW abcd lt CR gt 700 lt CR gt lt LF gt EZP 250 rese
4. active HIGH Since the reset ports T9 and P2 are connected internally you may connect one of the two ports 1 3 3 Serial Port Interface EZP 250 provides two serial ports One is connected to user terminal TE2 and the other is connected to modem MT2 If the amount of data to be transmitted is not large it is enough to connect just RXD and TXD of UART in TE2 but you must connect the control lines of all serial ports of MT2 Both ports may be connected through the RS232 driver depending on user applications 1 3 4 NC The NC port should not be connected 2 Using EZP 250 2 1 Operation EZP 250 is equipped with 2 serial ports One is connected to the equipment for Internet communication and the other is connected to a mobile phone or modem For the convenience of explanation its components and ports are defined as follows TE2 Equipment 4 EZP 250 4 Mobile terminal Modem MT2 terminal EZP 250 directly connects the serial ports of TE2 and MT2 upon power up It transmits all data received from the serial port of TE2 to that of MT2 and vice versa It can be assumed that the serial ports of TE2 and MT2 are connected directly However if the Escape Character hereinafter referred to as lt ESC gt is entered through the serial port of TE2 EZP 250 recognized the characters from lt ESC gt to CR hexadecimal 0x0d as a command The default value of lt ESC gt is hexadecimal 0x21 wh
5. can be provided with TCP or UDP communication in the command format defined by Sollae System EZP 250 supports TCP client mode TCP server mode UDP data transmission PING transmission etc depending on the commands 1 1 Components EZP 250 body EZP 250 evaluation board option 5V adaptor option RS232 serial cable option 1 2 Specifications Input Voltage 2 7V 5 5V Power Serial Modem MT2 2mm pitch 1x10 connector Serial port DTE UART 1200bps 230400bps Serial port UART 1200bps 230400bps Modem TCP UDP IP ICMP PPP TELNET PAP CHAP Socket communication program for test Utilities Bad Program for firmware downloading through serial pflas port 1 3 Interface 1mm 34mm T1 GND O P1 VCC T2 NC Q P2 RST T3 T RXD O P3 P DSR rms O pea T5 T RTS Q P5 P CTS ATmega64L T6 T CTS Q P6 P RTS T7 T DTR Q P7 P TXD T8 T DSR O P8 P RXD T9 RST 0 P9 NC T10 VCC P10 GND JP1 JP2 e JPI mmm CO 8 Freene ART o 10 m tren VART mo TO fe 5 Res Toese mm TO To menswem 17 Daw Temi Rey fo m paese TEN AA 19 reason UE m een sw Sid e JP m vece asi p m EE TO p m mesemesmwun TOTO M Da temi Resp TO e m orromon p E CU Fram vARTI ME TO Peeve VART toms 100 CS E N molam I DI CO 1 3 1 Power 2 7V 5 5V 1 3 2 Reset Reset is
6. esee LA Local IP Address nile edades PA Peer Host Address seen eene PP Peer TCP UDP Port sse PI Product Information eee SE Send ICMP Echo Message Ping ST BEZLI O SAUS ue ee e eden iie en TO T1 Trace Off OM sve io dette TA TCP Acceptz ete ete nite tte n ee LE PCP LOCAL Port ests det tree RH I0 ICPOpb n io iieri UL S UDP Local Port peine UPS PRP OP es oret eei uten 2 3 20 US UDP SONG ee der Lat 2 3 21 VO VI Verbose Response Off On 2 3 22 CESA eet Re alla ena ais eee iade tct eges 2 4 CEOSING TEP EE 2 4 1 TCP closed by external host sese enne 24 2 FCP closed bYEZP 2930 ee aria 2 5 dudo uU E 2 6 COMMUNICATION PHASES 2 5 5 retire ei ehe iners ai 3 OPERATION EXAMPLES eese enero re nio rin ere zio st tn tuse se see nio nio nenezenionenenee 3 1 CHANGINGSETTINGVAEUES ilaria t PA eine curtes 3 2 EXAMPLE OF PPP CONNECTION FAIL 3 3 EXAMPLE OF TCP CONNECTION FAIL 3 4 EXAMPLE OF TCP CONNECTION SUCCESS 3 5 EXAMPLE OF UDP DATA SEND RECEIVE 4 CUSTOMER SERVICE WARRANTY AND NOTES ON OPERATION 4 CUSTOMER SERVICE ot dee DI e D dose 4 2 WARRANTY tic esencia Uli 42 Refund ise innuens 422 Nosch rge S ah ES ERES Re ea dee te ra debct odi en 42 3 Charged A S gt antice tier edet debe inter teen a 4 3 NOTES ON OPERATION cssssessesecececsessseeceeccecsesssaeceeececs
7. number 2 3 10 PP Peer TCP UDP Port sc rr sore a This command is used to set a TCP UDP port of the server Only a decimal number is allowed for the port number 2 3 11 PI Product Information This command displays the firmware version and internal software module of EZP 250 If there are any problems you have to check the version and internal software module of your product with the PI command because a different module type may be used depending on its version 2 3 12 SE Send ICMP Echo Message Ping 16 This command is used to check if the remote host works normally by receiving a message in response to the transmitted ICMP echo request ping message This command is available after PPP connection Where a response to ICMP echo request is received the response code is displayed as follows Where no response is received the response code is displayed as follows 2 3 13 ST EZL 250 Status This command shows the PPP and TCP connection status of EZP 250 The output messages and their meanings are given below DEAD IWF or PPP down ESTABLISH LCP is being connected TERMINATE LCP connection is being closed PAP PAP authentication is in progress NETOWRK IP address is being allocated INET CLOSED Connected to the PPP server TCP closed LISTEN Waiting for TCP connection SYN SENT TCP connection signal transmitted SYN RCVD TCP connect
8. the baud rate of MT2 serial port A two digit hexadecimal value should be entered in the lt OP gt field Baud rates are given as follows depending on setting values Do 4so0bps FC_ 57600bps_ ra ips It is not permitted to change the baud rate of TE2 e g Change the baud rate of MT2 to 115200 bps lt ESC gt BR lt SP gt FE 0x46 0x45 lt CR gt 13 2 3 2 DO D1 DTR High Low aes oo r Those commands are used to convert the DTR signal output of MT2 to High DO or Low D1 The DTR output holds Low after a call has been connected and a short pulse created by High D0 Low D1 is required to release the call forcibly Basically a mobile terminal is automatically disconnected when PPP is closed However some modems which are not disconnected automatically should be released using the DTR signal 2 3 3 DN PPP Down This command is used to close the PPP connection After TCP has been disconnected TE2 has to disconnect the PPP connection using the DN command 2 3 4 EO El Local Echo Off On These commands are used set echo OFF EO or ON E1 for input character strings It is recommended to set echo to ON with the El command where it is necessary to check command input for the operation of EZP 250 in the process of product development 2 3 5 EC Escape Character 14 This command is used to change the lt ESC gt character lt OP gt carries the two digit hexadecimal value for an ASCII cod
9. 0 1700 COMMAND OK AT CRM 150 OK ATDT1501 CONNECT IUP 1710 PPP UP ITO 1720 TCP CONNECTED Command OK Set server TCP port Command OK CDMA setting AT command OK in Modem Make a call Call connection success in Modem PPP connect command PPP connection success TCP connect command TCP connection success 10 data transfer TCP data transfer Ht TCP close command 1900 COMMAND STATE Command state transition message 1820 TCP CLOSED TCP close message IDN PPP down command 1810 PPP DOWN PPP down DO DTR High command call clear 1700 COMMAND OK Command OK IDI DTR Low command 1700 COMMAND OK Command OK 2 2 EZP 250 Command and Response Code Format 2 2 1 Definitions The terms and definitions used in this document are listed below Name Hexadecimal Description mm lt ESC gt The escape character of EZP 250 The default value after BENE RM Lor omar depending on comanda Other values not given in lt gt or in the command format are ASCII values For instance BR is the two bytes of 0x42 0x52 2 2 2 Command Format A command of EZP 250 starts with lt ESC gt and finishes with lt CR gt and does not concern upper and lower cases The default value of lt ESC gt is 0x21 You can change this value using the EC command Since all parameters by commands are stored in the volatile memory their values are cleared to the default values after EZP 250 reset
10. EZP 250 User s Manual Version 1 3 8 Sollae System Co Ltd To all residents of the European Union Important environmental information about this product This symbol on this unit or the package indicates that disposal of this unit after its Q amp ljifecycle could harm the environment Do not dispose of the unit as unsorted municipal waste it should be brought to a specialized company for recycling It is your responsibility to return this unit to your local recycling service Respect your local environmental regulation If in doubt contact your local waste disposal authorities 1 OVERVIEW 1 1 1 2 1 3 1 3 1 1 3 2 1 3 3 1 3 4 2 USING EZP 250 2 2 2 2 2 1 2 2 2 2 2 3 2 9 2 3 1 2 3 2 2 3 3 2 3 4 2 3 5 2 3 6 2 3 7 2 3 8 2 3 9 2 3 10 2 3 11 2 3 12 2 3 13 2 3 14 2 3 15 2 3 16 2 3 17 2 3 18 2 3 19 Table of Contents OPERATION siii EZP 250 COMMAND AND RESPONSE CODE FORMAT DefinitlOhs1 44 oM ue aded ces te tete rodar E cides dee Command Format eese eerte Response Code Format eene EZ P 250 COMMANDS o dtt ttp re REI EUER TI HARE Te BR Baud Rate Of MT2 i DO D1 DTR High Low eeseeeeeeeeeeeeeee eene DN SPPP Down e o A i EO EL Local Echo Off On ireren netee taenia EC Escape Character esee BC Flow Control sre oi nia cos tesi thee ates ID PW PAP CHAP User ID Password
11. UNKNOWN COMMAND Invalid command 2 0 72 73 UDP SENT UDP data sent 74 0 0 0 ICMP RCVD Response to the ICMP echo request has been 0 BAD STATE EZP 250 is in the bad state PPP DOWN PPP connection fail or PPP closed 820 TCP CLOSED TCP connection fail or TCP closed timeout 840 ICMP TIMEOUT Fail in receiving response to ICMP echo request 820 UDP TIMEOUT EZP 250 didn t received during the given 840 2 3 22 HE Help This command lists the EZP 250 commands 2 4 Closing TCP To close TCP the host being connected should be closed or TE2 should transmit three lt ESC gt characters to EZP 250 2 4 1 TCP closed by external host TCP is closed when the external host being connected is closed At this time the following message is displayed 2 4 2 TCP closed by EZP 250 First EZP 250 has to transmit three lt ESC gt characters to notify closing TCP The process to close TCP is similar to the escape sequence for a standard model A guard time longer than 500ms is required before and after sending three lt ESC gt characters That is it is prohibited to send other characters for 500ms before after sending the character string to close TCP EZP 250 cannot recognize commands starting with lt ESC gt while TCP is connected but can recognize three lt ESC gt characters with a 22 guard time of 500ms 2 5 PPP Down Unlike TCP since PPP is rarely closed by the PPP server it can be ass
12. e of the desired lt ESC gt character The ASCII value of the current ESC character is displayed when no parameter is entered Since the value ranges can be from 00 through FF 2 3 6 FC Flow Control This command is used to set ON OFF for hardware flow control of the serial port connected to TE2 or MT2 You have to set FC to 01 10 and 11 for flow control on MT2 TE2 and both MT2 and TE2 respectively The current value is displayed when no parameter is entered Example Flow control on both serial ports lt ESC gt FC 11 lt CR gt 2 3 7 ID PW PAP CHAP User ID Password These commands are used to set user ID and password required for PAP or CHAP authentication Although authentication may be unnecessary for CDMA wireless network it may be required for PPP server connection from wired telephone network through modem depending on PPP server types or settings 2 3 8 LA Local IP Address 15 This command is used when a fixed IP address is assigned to PPP network Basically this command may be unnecessary because IP addresses for PPP connection are allocated dynamically Each number of IP address should separated with a dot like WWW Xxx yyy zzz Only a decimal value is allowed for each number 2 3 9 PA Peer Host Address This command is used to set an IP address of the server to be connected Each number of IP address should be separated with a dot like www xxx yyy zzz Only a decimal value is allowed for each
13. esssasceeececeeseaaeeeeececsensaseeeeeeceenea 5 ORDERING INFORMATION eeeeeeee seen seen etn sensns suns tn netu ee cenere sese sese stessa snas 6 REVISION HISTORY eeeeeeeeee eene ense tn seen renze sese senese seta setas senses neneeen ezio seta setas 1 Overview With the development of Internet technologies the demands for data communication over Internet are in increasing trends Data communication over Internet uses the Internet communication protocols TCP IP In other words devices are connected to Internet by implementing TCP IP protocols Users can implement TCP IP by implementing TCP IP protocol by themselves porting open TCP IP or using an Operating System OS However these methods have many restrictions in terms of time cost and technology The ezTCP series of Serial TCP IP protocol converters manufactured by Sollae Systems provide TCP IP communication Internet communication by simply connecting the serial ports ezTCP performs TCP IP processing on the data received from the serial port and sends the result to the Internet network In addition it performs TCP IP processing on the data received from the Internet network and sends the resulting raw data to the serial port EZP 250 provides TCP IP communication through PPP of ezTCP product groups By connecting one serial port of EZL 250 to user device and the other to mobile phone wireless modem dial up modem or TRS terminal users
14. ich can be changed to a character defined by user A mobile terminal that supports wireless Internet communication acts like a modem through the serial port You can do dialing like a typical modem and can connect with the packet network using AT commands An example to connect the packet network using a mobile terminal is shown below AT OK AT CRM 1 OK ATDT CONNECT After call setup using the AT command above TE2 transmits the UP command 9 to EZP 250 to perform PPP connection After PPP connection has been accomplished normally the mobile terminal can send receive UDP data to from the host connected to the Internet network using the US and UL commands It can also send receive TCP data to from the host computer connected to the Internet network using the TO command After TCP data communication is completed the remote computer can close the TCP connection or EZP 250 can close the TCP connection using lt ESC gt After TCP connection is cleared you have to close the PPP connection and release the call The procedure for TCP connection and TCP close is summarized below Make a call after modem setting Connect PPP UP Connect TCP TO Send receive data Close TCP ESC x 3 PPP down DN Call clear 1001 EZP 250 booting 1900 EI Input echo command 1700 Command OK IV Display response message 1700 COMMAND OK Command OK IPA 218 49 162 156 Set server IP address 1700 COMMAND OK IPP 147
15. ing Information Part number Description Etc EZP 250 EZP 250 E RoHS compliant Available from April 2006 30 6 Revision History Date Version Modification Nov 01 2005 1 1 The first release Dec 26 2005 1 2 Added Trash Mark for WEEE Mar 07 2006 1 3 Add response string table in VO V1 command section Add response string item in Response code format section Add Ordering Information 31
16. ion signal received ESTABLISHED TCP connected FIN WAITI The TCP closed signal has been transmitted FIN WAIT2 ACK to the TCP closed signal has been received CLOSE WAIT The TCP closed signal has been received CLOSING The TCP closed signal has been transmitted received concurrently LAST ACK Waiting for acknowledgement to the TCP close signal TIME WAIT Waiting for confirming TCP closed 17 2 3 14 TO TI Trace Off On These commands are used to set tracing PPP and TCP connection to OFF TO or ON T1 The progress in PPP and TCP connection is displayed provided that Trace is set to ON At this time the output messages are the same as those displayed by the ST command 2 3 15 TA TCP Accept This command is used to accept TCP connection from the remote host The equipment connected to the PPP network typically acts as a client The TA command of EZP 250 is used to run such equipment as a server After PPP connection if a TCP local port is set using the TL command and an external host attempts connection to the port EZP 250 accepts the TCP connections and displays the following message If the TO command is executed before TCP connection after running the TA command the TA command is ignored and EZP 250 is connected to the external host as a client After TCP connection EZP 250 commands are not available because all data transmitted from TE2 is transferred to the ho
17. lt Timeout gt Time interval to separate data blocks to be transmitted Unit 10 ms This command is used to send UDP data to the IP address set by PA and the port set by PP Unlike TCP UDP transmits data by the block Therefore the number of bytes to be transmitted or its duration should be set to define a block UDP data is transmitted provided that one of the two parameters is fulfilled timeout may be ignored shaded field in the above figure When UDP data is transmitted the following message will be displayed In case of UDP data transmission fail due to timeout the following message will be displayed 20 The following shows examples of US command IUS S lt CR gt Command to send 5 byte UDP data hello Send 5 byte data 1730 lt CR gt lt LF gt UDP data transmission completed IUS 3 100 lt CR gt Command to send UDP data block interval of 1 sec No data transmitted for 1 sec 1830 lt CR gt lt LF gt UDP data transmission fail 2 3 21 VO VI Verbose Response Off On lt ESC gt lt CR gt These commands are used to display the response code followed by string so that those developers who use EZP 250 first can easily understand meanings of output messages When Verbose is set to OFF VO all response codes are displayed in the following format The response strings for commands are given as follows 500 COMMAND STATE Ezrastissatv receive commands 720 TCP CONNECTED TCP connected received
18. nnect command 1820 lt CR gt lt LF gt IDN lt CR gt PPP down command 1810 lt CR gt PPP down NO CARRIER lt CR gt lt LF gt Call release Data transferred from MT2 TCP connection fail 3 4 Example of TCP Connection Success IPA 211 22 78 210 lt CR gt Set server IP 1700 lt CR gt lt LF gt Command OK IPP 1470 lt CR gt Set server TCP port 1700 lt CR gt lt LF gt Command OK AT CRM 1 lt CR gt Set modem Transferred to MT2 OK lt CR gt lt LF gt Command OK Data transferred from MT2 ATDT lt CR gt Dialing Transmitted to MT2 CONNECT lt CR gt lt LF gt Call connected Data transferred from MT2 IUP lt CR gt 1710 lt CR gt lt LF gt ITO lt CR gt 1720 lt CR gt lt LF gt lt data transfer gt ui PPP connect command PPP connection success TCP connect command TCP connection success TCP data send receive Transition to the command mode with three lt ESC gt characters 26 1900 lt CR gt lt LF gt 1820 lt CR gt lt LF gt IDN lt CR gt 1810 lt CR gt lt LF gt NO CARRIER lt CR gt lt LF gt Transition to command mode TCP closed PPP down command PPP down Call release data from transferred from MT2 3 5 Example of UDP Data Send Receive IPA 211 22 78 210 lt CR gt 1700 lt CR gt lt LF gt IPP 1470 lt CR gt 1700 lt CR gt lt LF gt UL 2000 lt CR gt 1700 lt CR gt lt LF gt AT CRM 1 lt CR gt OK lt CR gt lt LF gt ATDT lt CR gt CONNECT lt CR gt lt LF gt UP lt CR gt
19. rged A S For product failures after expiry of the warranty period or resulting from user s fault repair service will be charged or the product will be replaced at user s expense 4 3 Notes on Operation e Sollae System is not responsible for product failures caused by user s alteration of the product e Specifications of the product are subject to change without prior notice for performance improvement e Sollae System does not guarantee normal operation of the product under conditions beyond the specified limit e Reverse engineering of the firmware and applications provided by Sollae System 28 should be prohibited The firmware and applications provided by Sollae System should not be used for purposes other than the specified use Do not use your product at an extremely cold or hot place or under an environment with severe mechanical vibration Do not use your product under a highly humid or oily environment Do not use your product under an environment involving corrosive or flammable gases Sollae System does not guarantee normal operation of the produce under noisy environment Do not use the product for applications that require exceptional quality and reliability associated with human injuries or accidents aerospace aircraft health care nuclear power transportation traffic and safety purposes Sollae System is not responsible for any accidents or damages caused by using your product 29 5 Order
20. st over TCP 2 3 16 TL TCP Local Port 18 This command is used to set a port number for EZP 250 to act as a server This command is used along with the TA command 2 3 17 TO TCP Open This command is used to attempt connection with the TCP port of the remote host defined by PA command and PP command The following message is displayed in case of TCP connection success The following message is displayed in case of TCP connection fail After TCP connection EZP 250 commands are not available because all TCP data sent from TE2 is transferred to the host connected 2 3 18 UL UDP Local Port lt ESC gt lt OP gt Port Number This command is used to set a port to receive UDP data When data is received through the UDP local port EZP 250 converts the UDP data to raw data and transfers it to TE2 2 3 49 UP PPP UP This command is used to initiate PPP connection This command is available after the CONNECT message has been displayed after sending the ATDT command to the modem The following message is displayed in case of PPP connection success The following message is displayed in case of connection fail After PPP has been connected PPP UP UDP data can be transmitted or received using US and UL commands In addition it is possible to connect TCP using the TO or TA command and to perform ping test using the SE command 2 3 20 US UDP Send Size Number of bytes to be transmitted by one block
21. t Set MT2 serial port to 115200bps Command OK Confirm the baud rate of MT2 serial port Display the setting value Command OK Change lt ESC gt to 0x23 Command OK Set PAP User ID to eztcp Command OK Confirm PAP User ID Display PAP User ID Command OK Set PAP User Password to abcd Command OK 3 2 Example of PPP Connection Fail IPA 211 22 78 210 lt CR gt 1700 lt CR gt lt LF gt IPP 1470 lt CR gt 1700 lt CR gt lt LF gt AT CRM 1 lt CR gt OK lt CR gt lt LF gt ATDT lt CR gt CONNECT lt CR gt lt LF gt IUP CR 1810 lt CR gt lt LF gt NO CARRIER lt CR gt lt LF gt Set server IP Command OK Set server TCP port Command OK Set modem Transferred to MT2 Command OK Data transferred from MT2 Dialing Transmitted to MT2 Call connected Data transferred from MT2 PPP connect command PPP connection fail Call release Data transferred from MT2 25 3 3 Example of TCP Connection Fail IPA 211 22 78 210 lt CR gt Set server IP 1700 lt CR gt lt LF gt Command OK IPP 1470 lt CR gt Set server TCP port 1700 lt CR gt lt LF gt Command OK AT CRM 1 lt CR gt Set modem Transferred to MT2 OK lt CR gt lt LF gt Command OK Data transferred from MT2 ATDT lt CR gt Dialing Transmitted to MT2 CONNECT lt CR gt lt LF gt Call connected Data transferred from MT2 UP lt CR gt 1710 lt CR gt lt LF gt TO lt CR gt PPP connect command PPP connection success TCP co
22. umed that PPP is closed by EZP 250 or by call release due to communication fail After TCP has been closed TE2 should close PPP using the DN command Typically the time required for PPP down is about several tens of milliseconds However where call is cleared due to communication fail more than 4 seconds may be required for PPP down and EZP 250 should wait for the 810 message displayed Since the process for PPP down is simple compared with closing TCP it is enough to check the down message of EZP 250 Since call may be released while transmitting receiving TCP data it is necessary to monitor the PPP down message transmitted from EZP 250 After normal PPP down TE2 has to ensure that the call has been released by checking NO CARRIER or response to the AT command There are some mobile terminals that would not be disconnected automatically although most mobile terminals are automatically disconnected after PPP down For such mobile terminals call should released by creating a pulse of moderate duration for the DTR pin using the DO DI command Where the DTR pin is not connected call may be released using the escape sequence However it is desirable to connected DTR line to mobile terminal because there are some mobile phone types that do not support this scheme 2 6 Communication Phases EZP 250 processes serial port data depending on communication phases The following table describes each communication phase of EZP 250
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