EZL-200 User`s Manual
Contents
1. If more than one ezTCP is detected ezTCP s MAC ADDRESS will be displayed in the MAC ADDRESS LIST box on ezConfig Check if the MAC ADDRESS displayed in the MAC ADDRESS LIST window corresponds to that printed on ezTCP main body The following screen shows this process for fo fes foo ops 0 BAC ADDRESS LIST SUEMET MASK 00 30 291002 00203 255 0 0 0 GATERLY 10 0 0 254 HAME SERVER LOCAL PORT FEER PORT 1470 MAT IP ADDRESS WATER HABE es es mat Pup Rem F jer Pacer M PRE TELNET F For FEEF IP ADDRESS Select T2S 0 in the MUX TYPE field on ezConfig Setup LOCAL IP ADDRESS LOCAL PORT and the serial port settings according to a test environment as required When the setup is completed pressing WRITE will save the changed values in ezTCP If an error message pops up during storing the configuration check that ezTCP is connected correctly and then try again EZL 200 User s Manual In Windows MS DOS prompt window check the IP address is set correctly by giving the PING command If the ezTCP IP address is set correctly the PING results will be displayed as follows If a message Request timed out is displayed check that IP address setup value again C gt ping a b c d Pinging a b c d with 32 bytes of data Reply from a b c d bytes 32 time 1ms TTL 64 Reply from a b c d bytes 32 time 1ms TTL 64 Reply from a b c d bytes 32 time 1ms TTL 64 Reply from a b c d bytes 32 time 1ms2. Blinking 1 time per 1 second after the IP address is assigned PPPoE Blinking 4 times briefly in the normal state 1 time per 1 second when the IP address is successfully assigned after attempting a connection in ATC COD mode 4 times briefly after returning the IP address when the connection is terminated If a TCP connection is successfully established irrespective of the IP allocation scheme STATUS LED is turned on If the TCP connection is terminated LED will start blinking again 24
3. ezConfig can be used to change the IP address related items the serial port setup value the serial port operation mode and how to setup ezTCP This section describes these functions briefly For more information see the following sections The items you should setup when using T2S mode of ezTCP are listed as follows LOCAL IP ADDRESS ezTCP IP address SUBNET MASK subnet mask GATEWAY network gateway BAUD RATE UART port baud rate DATA BITS UART data bits PARITY UART parity FLOW CTRL hardware flow control MUX TYPE ezTCP serial interface type TIMEOUT connection time out LOCAL PORT listening TCP port number 2 1 2 Basic Function Setup The following example shows how to read and change ezTCP s basic functions Try changing ezTCP setup value according to the following sequence When the ezTCP power is turned on and the LAN cable is connected correctly pressing PROBE or READ button will display the following window Reading sSzTCP s environment variables HAC address 00 30 9 00 00 020 EZL 200 User s Manual If a network attached ezTCP is detected the following message will be displayed If a message pops up indicating that there is no response from ezTCP check that the power is turned on and the cable is connected correctly then try pressing PROBE or READ button Searching szTCe l zTCPis found
4. Co Ltd msh gt 3 3 3 IP Address related Item Setup through DHCP Server Under environment with a network operating a DHCP server DHCP protocol allows you to automatically set the IP address subnet mask gateway and name server of ezTCP Using DHCP automatic setup function requires you to check DHCP item on ezConfig Note that you may have to check ARP item according to the type of DHCP servers 3 3 4 IP Address related Item Setup under Environment with ADSL The data transmission reception and IP allocation over ADSL are typically based on PPPoE protocol which is embedded in ezTCP PPPoE mode is activated by checking PPPoE item on ezConfig If the ADSL modem independently supports the PPPoE communication function or an IP sharer is used you should use this function through a fixed IP or DHCP without checking PPPoE 3 3 5 Environment Setup using Telnet or Console You can also setup the environment through the internal shell application of ezTCP as well as AT command There are two ways to use the shell application of ezTCP A EZL 200 is capable of shifting the serial port to the console port Connect JP1 to C and turn the power on Then the serial port of EZL 200 will shift to the console port After shifting to the console port you can easily set the environment by connecting a standard serial port cable to PC When the environment setup has completed make sure to connect JP1 to N to operate ezTCP If the serial
5. Cae ax oe TEETE GEJA EEA F When 1234 is input from Hyper Terminal the output result is EZL 200 User s Manual shown on telnet terminal as follows S 285 Himi ket 714 If the text appears garbled check if items related to the serial port of ezTCP correspond to the serial port setup value of Hyper Terminal If nothing is input on the keyboard for specified period of time when the TIME OUT value of ezConfig is set bigger than 0 telnet terminal will terminate the connection while displaying a connection termination message EZL 200 User s Manual 3 Advanced Function of ezTCP 3 1 Serial Port Interface ezTCP supports three types of the serial communication interface mode T2S ATC and COD In T2S and COD modes you can use ezTCP by simply connecting the serial port without modifying existing equipments software While in ATC mode the existing equipments software needs modifying For ATC mode the AT emulation function is supported and it allows you to use ezTCP for a standard modem Those who have experienced with modem operation will take advantage of the full ezTCP functions without effort EZL 200 supports the three interface types on board and you can select those functions through telnet AT emulation console or ezConfig The typical functions of each mode are listed below The note at the end of each paragraph describes the items you should change through ezConfig when using the
6. EZL 200 User s Manual Revision B Taa Qe fo AS a TEF 3 ma ene 09 Baa 1 Overview KR V N N a V ATT 1 1 1 Components sestetreeereaen nesen even ene ne nne nen ovnen ene na sne nennnenenennnr nen 1 1 2 Specifications tteteeteteeteteeeseveseveveneveneseneesensaseneesen reven nnmnnn mnene eee 1 1 3 EZL 200 Layout eseesetersesesenesenensensevnsensavensevensenavensenensensenensensesensesensonensen 1 1 4 Installation tees ees eee eee tee aie eran aad 2 1 5 Feature Overview neon 2 2 Getting Started with SZTCP rerererresesesreveversenaverseeserveverseseserreverseseserersesessener 3 2 1 ezTCP Configuration siren nnsensensensensensensennennne 3 2 1 1 amp ZConfig eteteeteseeseeeevenesevsevressevenseevensenvensessensesresrevensersensensensesrensensnnnn 3 2 1 2 Basic Function Setup gt seseeseesseeseensensrnsenssenssensenssensennsensrnnsensennsenne 5 25 Communication Tea irik oen einne nene kius riia a sE oaia aE iS 7 3 Advanced Function of ezTCP 2 nnnndnninnnadnnnna andansda dunnndnnnnnndunannnndnnnnnnnnna 10 3 1 Serial Port Interface srrrrrtrrerrrnrnnnr renn venn nnnnnnnnnnn venn anennnnnnnnnennnnnnnnnnenn 10 3 1 1 T2S TCP to Serial etestestestersreveessensenvenssensensensenssavsensensenseessensennen 10 3 1 2 ATC AT Command sseetteresestensensenvnvennsnnsensensensensnvsenennsensensensensennnn 10 3 1 3 COD Connect On Demand vere 11 3 1 4 TCP Connection Time Out TIME O
7. If the connection is successful this mode will transmit data already received from the serial port to the TCP port and then exchange data between the TCP port and the serial port like the T2S mode In COD mode a TCP connection will begin when the size of data received from the serial port exceeds the pre specified size water mark and the size is changeable factory set value is 1 byte If the setup value is 0 a connection will begin right after the power is turned on setup fields TIMEOUT WATER MARK PEER PORT PEER IP ADDRESS 3 1 4 TCP Connection Time Out TIME OUT ezTCP will terminate the connection if there is no data exchange for a specified period of time The time period can be selected from 1 to 600 seconds and the Time Out function is cleared if the time period is set to 0 second If the Time Out is set to 10 seconds the connection will be terminated after ten seconds when transmitting the last data If the Time Out function is cleared some problem may occur because the TCP connection status of ezTCP will remain unterminated when a host connected to ezTCP is shut down abnormally If the Time Out is set to 0 the Keep alive function on the TCP will be activated while the Time Out function is cleared The Keep alive transmits the 11 EZL 200 User s Manual keep alive packets and waits for their responses if there is no data exchange for a specified period of time If no responses to the keep alive packet
8. K_TYPE T2S 0 MUK_TYPE COD 2 MUX TYPE COD 2 MUX TYPE COD 2 Note The output of the underlined parts depends on the setup value of the item next to 21 EZL 200 User s Manual 3 4 ezTCP Environment Setup Item 3 4 1 Network related Setup Item Description enabe ezConfig probe read write Y N enable IP update by host ARP table Y N enable DHCP auto configuration Y N enable PPPoE Y N USERNAME ADSL PPPoE User ID PASSWORD ADSL PPPoE User Password LOCAL IP ezTCP s IP Address SUBNET MASK IP Network Subnet Mask GATEWAY gateway If you set EZCFG item to NO searching for ezTCP or changing the setup value through ezConfig will not be available You may have to set ARP item to YES depending on the types of DHCP server when using DHCP function 3 4 2 Serial Port Setup Item Description BAUD RATE UART baud rate 1200 115200 PARITY O no parity 1 even 2 odd DATA BITS data Bit 7 8 RTSCTS hardware flow control Y N For STOP bit only 1 bit is supported and it cannot be changed XON OFF Flow Control is not supported 22 EZL 200 User s Manual 3 4 3 Serial Port Interface related Item Description connection Time Out T2S 0 ATC 1 COD 2 LOCAL PORT listening TCP port number in T2S Mode WATER MARK If the amount of data specified in watermark is received from the serial
9. TCP port EZL 200 User s Manual 2 Getting Started with ezTCP 2 1 ezTCP Configuration This section describes how to configure and test T2S mode which is the most convenient mode among the serial port interfaces of ezTCP For more information about the other modes see the following sections 2 1 1 ezConfig The basic environment information of EZL 200 can be configured through console telnet DHCP ARP and ezConfig This section takes an example of using ezConfig which is an Integrated Management Application for Windows For the other configuration modes see the following sections ezConfig can run on Microsoft Windows platform but may not operate on some of the existing operating systems The screen below shows the initial screen of ezConfig HAC ADDRESS LOCAL IF ADDRESS BAUD RATE DATA BITS BG fo fes foo fo fa Po TEN KAT ADDRESS LIST SUEMET MASE PARITY FLOM CTRL GATEWAY HUX TYPE TIME OUT MAKE SERVER LOCAL PORT PEER F RT MAT IF ADDRESS v r PEER IP ADDRESS PASSS0RD F F r FI F FE mm READ PEDE EXIT EZL 200 User s Manual Each button on ezConfig functions as follows 066 This button is used to search for all of the network attached ezTCPs The search results will be displayed on the MAC ADDRESS LIST box and you can select an item using a mouse or cursor as required The value displayed on the box indicates the MAC ADDRESS of each ezTCP The selected setup value of ezTCP will be displayed
10. TTL 64 2 2 Communication Test You can conduct a simple test using Hyper Terminal or telnet terminal for Windows if the IP related items of ezTCP are set correctly through ezConfig A communication test will be conducted as follows Connect the serial cable to the serial ports of both ezTCP and PC respectively Run Hyper Terminal change the serial port baud rate data bit parity bit and flow control and then save the changed values Each setup value must correspond to those configured by ezConfig In Windows MS DOS prompt window run telnet terminal according to the following process Note that a b c d is the ezTCP IP address and xxxx is the value of ezTCP s LOCAL PORTI C gt telnet a b c d xX EZL 200 User s Manual If telnet terminal is successfully connected RUN LED of ezTCP will stop blinking and shift to a constant lightened state If RUN LED is blinking regularly after running telnet terminal check ezTCP setup value again If the telnet terminal connection is successfully established Hyper Terminal and telnet terminal will be connected to each other through ezTCP as shown in the following picture Ethernet Serial Telnet rer o arr Hypertarminal When the two ends are connected to each other a character input from telnet terminal will be output to Hyper Terminal and vice versa When abcd is input on telnet terminal the output result is shown as follows Fr Bib Ane App Ge kir
11. UT sss 11 3 2 AT Command Interface ms Oo een tanta eee 13 3 21 Basic AT elariit iishit oe er ere cere renee reece 13 3 2 2 Extended AT Command 13 3 2 3 AT COMMAND Escape Sequence smeri 14 3 2 4 Examples of ATC Application ricci 15 3 3 Environment Setup seteeereereseseerensenrensensanense nen ensenrnnensenensenrnnensennennnnn 17 3 3 1 Environment Setup in ATC mode ssreesseresssrsensssresssrensssrnnsssnnnnsnn 17 3 3 2 IP Address Setup using ARP eeerererereveserrerevesernrrerereseserseresesernenen 18 3 3 3 IP Address related Item Setup through DHCP Server s 19 3 3 4 IP Address related Item under Environment with ADSL 19 3 3 5 Environment Setup using Telnet or Console vm 19 3 4 ezTCP Environment Setup Item gt ssersersessessensensrnnrenensensensensensensennenne 22 3 4 1 Network related Setup Item ccc tenets 22 Table of Contents 3 4 2 3 4 3 3 4 4 3 4 5 3 4 6 Serial Port Setup Item saakananannnannnnnnnnannnnnanannnnnnnnnnannnnunnannunnnnnnnnunnunnnanndanar 22 Serial Port Interface related Item NE asendas 23 Miscellaneous PPPEPETE Pee rereee Ter TIT TPE rire re errr er errr Teter eer e reer reer eee eee eee eee eee eee 23 ezTCP Operation according to Console Jumper rm 23 STATUS LED State Variation PEPTEP PEEP reere ee rrreerreee eer ee errr rer rere errr ere cree 24 EZL 200 User s Manual 1 Overview 1 1 Components EZL 200 RS232 Cable DC 5V SMPS Power Adaptor 1 2 Specificatio
12. X Linux platform the command arp enables you to change the contents of arp cache table from the host computer After changing the contents of the arp cache table your attempting a telnet connection or a ping test will change the ezTCP s IP address IP address changed by the arp command will not be stored in EEPROM Therefore you should change the IP related items by giving env if command through telnet access ezTCP allows you to change the IP address only one time after the power is turned on For that reason you should reset ezTCP when changing the IP address The example listed below shows how to change the arp cache table on Windows MS DOS prompt window and Linux If ezTCP s Ethernet address is 00 30 f9 00 00 01 and the IP address to use is a b c d you can change the IP address as follows Windows C gt arp s a b c d 00 30 f9 00 00 01 add ARP cache entry C gt arp a Show ARP cache Interface XX XXXXXKKXX On Interface XXXXXXXX Internet Address Physical Address Type a b c d 00 30 19 00 00 01 static C gt telnet a b c d Connect to ezTCP C gt Linux rtos gt arp s a b c d 00 30 f9 00 00 01 add ARP cache entry rtos gt arp Show ARP cache Address HWtype HWaddress Flags Mask Iface a b c d ether 00 30 49 00 00 01 CM eth0 rtos gt telnet a b c d Connect to ezTCP Trying a b c d 18 EZL 200 User s Manual Connected to a b c d Escape character is T MIC vi 1 Am188 Copyright c Sollae Systems
13. f the string and connecting to the TCP port no 6000 are exemplified as follows ATE Echo forbidden gt gt lt lt OK ATV PRIP aa bb cc dd PRP 6000DT actually gt gt lt lt 1 lt lt Data Transmission Recention gt gt 16 EZL 200 User s Manual 3 3 Environment Setup Environment variables such as the IP address the serial port rate the connection port number and the serial communication mode can be changed by using AT command the internal shell applications of ezTCP and ezConfig 3 3 1 Environment Setup in ATC mode After changing the environment setup value you must use the PWP command PWP is used to store the changed value in the actual EEPROM If the ezTCP power is turned on or EEPROM configuration is changed by PWP command NO CARRIER message is displayed The examples listed below are for setting each item AT PLIP aa bb ce dd eZzTCP s IP Address gt gt lt lt OK AT PGIP bb cc dd ee Gateway IP Address gt gt lt lt OK AT PSM 255 255 255 0 Subnet Mask gt gt lt lt OK AT PLP 1470 ezTCP s Listening TCP Port gt gt lt lt OK AT PTO 10 Reception Time Out gt gt lt lt OK AT PWP Storing the Setup Value gt gt lt lt OK lt lt NO CARRIER 17 EZL 200 User s Manual 3 3 2 IP Address Setup using ARP On Windows and UNI
14. ns Processor 16 bit Memory ROM 128K RAM 128K Interface 10Base T 9 Pin D Sub Male Protocols TCP UDP IP ICMP Ethernet ARP PPPoE DHCP TELNET server client Power DC 5V 10 1 3 EZL 200 Layout T au AV a5 LDT S EEE FUN LED 10Base T Ethernet RE TX EZL 200 User s Manual 1 4 Installation Make sure that RUN LED is blinking regularly after the power is turned on If LED is not turned on make sure that the power adaptor is connected firmly After checking LED connect RS232 cable and 10Base T cable to each port of the main body separately and then EZL 200 is now available 1 5 Feature Overview EZL 200 hereafter ezTCP is a serial port to TCP IP converter in which one serial port and one Ethernet port 10Base T are installed The serial port should be connected to a serial port of the control unit hereafter DTE and the Ethernet port should be connected to a switching hub or dummy compatible with the 10Base T standard The following figure outlined a serial to Ethernet conversion system configured with ezTCP HOST HOST HOST H Controller Terminal Remote Dev UART ezTCP Ethernet If a host computer hereafter a host is connected to the TCP port of ezTCP over an Ethernet network the serial port of the DTE is connected virtually to the TCP port of the host Then ezTCP will function as an intermediate device between the serial port and the
15. on the right side mi You can see only the ezTCP configuration details if you press this button after entering the 6 digit hexadecimal number printed on the ezTCP main body in the MAC ADDRESS box It is useful when there are too many ezTCPs attached to the network to search for one from the LIST box HRITE This button is used to save the changed value in ezTCP after modifying the configuration Make sure not to press this button during operating ezTCP since ezTCP will automatically be reset right after its environment setup value is saved Otherwise it may cause malfunction EIT This button is used to close ezConfig You can also close it by pressing ESC key on the keyboard rare ezTCP provides User Authentication function to prevent an unwanted person from modifying the configuration The authentication process is performed through the password string verification When entering or changing the password strings you can use this button Changing the ezTCP configuration details if a password has been entered requires the proper password to be entered in the PASSWORD field sm This button is used to read a dynamic variable value during operating ezTCP Pressing this button will display a new window where the time lapse after the power is on the current IP address and the data throughput of the serial port are indicated Double clicking each item on the MAC ADDRESS LIST will carry out the same function EZL 200 User s Manual
16. port is used for the console port the data rate will be fixed to 19200 bps 19 EZL 200 User s Manual B If ezTCP s IP address is assigned a host can be connected to ezTCP through telnet When accessing telnet the internal shell application of ezTCP will run and users can set the environment through telnet terminal Using ARP or DHCP described in the previous section enables you to change the IP address without using AT command or console The items which can be set through the shell application are network information if connection password pwd and ezTCP information ezl In the shell application the command env is used to setup environment The factor such as if pwd and ezl can be used for env The following results are the output of the factory set value MIC vi 1 Am188 Copyright c Sollae Systems Co Ltd msh gt msh gt env if MAC ADDR C KK KK KK KK KK KK EZCFG Yes ARP Yes DHCP No PPPOE No USERNAME No PPPoE Enabled PASSWORD no passwd PPPoE Enabled LOCAL IP 10 1 0 1 DHCP PPPoE Disabled SUBNET MASK 299 0 0 0 DHCP PPPoE Disabled GATEWAY 0 0 0 0 DHCP PPPoE Disabled msh gt msh gt env pwd PASSWPRD no passwd 20 msh gt msh gt env ezi BAUD RATE 19200 PARITY 0 DATA BITS 8 RTSCTS No TELNET Yes MUX TYPE 1 TIME OUT 10 LOGAL PORT 0 WATER MARK 1 PEER IP 0 0 0 0 PEER PORT 0 msh gt EZL 200 User s Manual MU
17. port in COD mode eztcp attempts connecting to the host PEER IP IP address to which ezTCP will attempt TCP connect when using COD mode PEER PORT TCP port to which ezTCP will attempt connecting when using COD mode 3 4 4 Miscellaneous Description connect to ezTCP using telnet Y N PASSWORD password string for changing ezConfig settings Note You can enter password up to 8 characters in English language If you enter on the console the existing password will be cleared and you will not be asked to enter password when accessing telnet or changing the ezConfig configuration 3 4 5 ezTCP Operation according to Console Jumper When the console jumper JP1 is connected ezTCP changes the serial port to the system console while releasing all of its security functions If the console shift jumper JP1 is detected to be properly connected right after the power is supplied even when ezConfig or telnet items are set to NO the configuration of telnet and ezConfig will be converted to be enabled And you will not be asked to enter a password when accessing telnet or using ezConfig When you forgot the password you can delete the existing password or change it to another by using the console shift jumper JP1 23 EZL 200 User s Manual 3 4 6 STATUS LED State Variation Fixed IP Blinking 1 time per 1 second DHCP Blinking 4 times briefly until the IP address is assigned
18. relevant mode 3 1 1 T2S TCP to Serial In this mode ezTCP always wait for a connection request from an external device without voluntarily connecting itself to an external server or PC In case an external host is connected to the specified port of ezTCP ezTCP will connect the serial port to the TCP port That is it transmits data from the serial port to the TCP port and data from the TCP port to the serial port This mode allows you to use ezTCP without modifying the existing equipment s software while using COD mode In T2S mode care should be taken that all data from the DTE to the serial port will be ignored until a connection from a certain external PC to ezTCP is established setup fields TIME OUT LOCAL PORT 3 1 2 ATC AT Command You can use ezTCP for a standard modem The extended commands supported by ezTCP allow you to designate the IP address and the port number of a host on the Internet and connect it through 10 EZL 200 User s Manual ATD T command After designating the connection standby port using ATA command will also connect a host to ezTCP For more information see the following sections setup fields TIME OUT 3 1 3 COD Connect On Demand COD mode allows ezTCP to voluntarily connect with the TCP port on an external PC or a server When a DTE transmits data to the serial port ezTCP will attempt connecting with a certain TCP port on the specified computer that already has IP address
19. s are received consecutively for five times it will forcibly terminate the current TCP connection You do not need to pay attention to this operation since it is the internal TCP module function The keep alive function is optional for the TCP IP protocol specification On some operating systems this function may not be available If you want to terminate the connection from ezTCP in COD mode it is recommended to use the Time Out function 12 EZL 200 User s Manual 3 2 AT Command Interface In ATC mode using the standard AT command and the ten extended AT commands enables you to access the Internet If the connection is successful CONNECT message is displayed and if the connection is failed or terminated NO CARRIER message is displayed which is similar to a standard modem The modem commands supported by ezTCP are listed below 3 2 1 Basic AT Command Function Note passive connection Host gt gt ezTCP connection active connection ezTCP gt gt Host connection echo E0 disable E1 enable off hook hang up call Inquiry ezTCP information output Online online command state gt gt online enable result code VO numeric V1 string reset reset AT command module 3 2 2 Extended AT Command ezTCP provides the unique extended command for the control of the Internet related setup values which are not supported by a standard modem The extended AT commands start with AT P and are follo
20. to 500 milliseconds 14 3 2 4 Examples of ATC Application Telnet server connection client mode EZL 200 User s Manual AT PRIP aa bb cc dd Telnet Server IP Address gt gt AT PRP 23 Telnet Port Number gt gt ATDT gt gt lt lt CONNECT lt lt Data transmission reception gt gt In case the telnet server terminates the connection lt lt NO CARRIER In case the DTE terminates the connection lt guard time gt lt guard time gt gt gt lt lt OK ATH Connection Termination gt gt lt lt OK TCP port no 6000 connection AT PRIP aa bb cc dd Server IP Address gt gt AT PRP 6000 Port Number gt gt ATDT gt gt lt lt CONNECT lt lt Data Transmission Recention gt gt Server Mode AT PLP 6000 listening TCP port gt gt lt lt OK 15 EZL 200 User s Manual ATA gt gt wait until remote host connects to ezTCP lt lt CONNECT connection notifier lt lt Data Transmission Recention gt gt lt lt INO GARRIER Connection terminated Examples of using Multiple Commands Like a standard modem ezTCP supports simultaneous multiple commands input Forbidding the echo command outputting the return value as the number instead o
21. wed by the equal sign for setting up values The question mark should be added to the end of the command when outputting the setup value For example enter the command when changing or checking ezTCP s IP address as follows AT PLIP a b c d gt gt lt lt OK AT PLIP gt gt lt lt ab c d The extended commands available on ATC mode are listed below 13 EZL 200 User s Manual Function local IP address subnet mask default router listening TCP port timeout remote machine IP address remote machine TCP port write configuration write setting to EEPROM Setup Value ON OFF Command PRC EZCFG PARP ARP PDC DHCP PPE PPPoE and PRL TELNET The ON OFF commands are set to ON 1 or OFF 0 3 2 3 AT COMMAND Escape Sequence When forcibly terminating the TCP connection of ezTCP you should shift the online state to the online command state through escape sequence Under the online command state entering ATH will terminate the TCP connection and entering ATO will restore it to the online state The guard times are required before and after the character transmission as follows Until inputting 1st after the last transmit More than 500ms input interval 0 500ms delayed time after inputting the last More than 500ms Note The figures above require the guard time be set
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