Patton electronics EtherBITS 2211 Getting Started Manual Download Page 62

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Protocols

Models 2211 & 2232 Getting Started Guide

B • Specifications

Protocols

Model 2211

•

ARP, IP/ICMP, TCP, Telnet, DHCP client, WEP

Model 2232

•

ARP, IP/ICMP, TCP, Telnet, DHCP client, PPPoE

Security

•

SecurityUser ID & Password

Management

•

Telnet or serial console port or EtherBITS Manager

•

Full-featured system status display

Diagnostic LEDs

•

Power LED

•

Ready LED

•

Serial Rx/Tx LED for data serial port

•

Link LED for10Base-T

•

Act LED for 10Base-T

Environmental

•

Operating temperature: 32 to 131°F (0 to 55°C)

•

Storage temperature: 25 to 151°F (-4 to 66°C)

•

Humidity: 90% (Non-condensing)

Physical

Model 2211

•

Dimensions: 3.22W x 4.48D x 1.02H in. (82W x 114D x 26H mm)

•

Weight: 10.6 ounces (300 g)

Model 2232

•

Dimensions: 3.9L x 2.8W x 1H in. (100L x 72W x 22H mm)

•

Weight: 8.1 ounces (230 g)

Summary of Contents for EtherBITS 2211

Page 1: ...Server Model 2232 EtherBITS RS 232 Single Port Device Server Getting Started Guide Sales Office 1 301 975 1000 Technical Support 1 301 975 1007 E mail support patton com WWW www patton com Document Number 08311U1 001 Rev A Part Number 07M2232 GS Revised May 12 2006 ...

Page 2: ...n repair or replace the product should it fail within one year from the ﬁrst date of the shipment This warranty is limited to defects in workmanship or materials and does not cover customer damage abuse or unauthorized modiﬁcation If the product fails to perform as warranted your sole recourse shall be repair or replacement as described above Under no condition shall Patton Electronics be liable f...

Page 3: ...del 2211 only 30 4 IP address configuration 34 5 Host Mode configuration 39 6 Serial port configuration 50 7 System administration 53 8 Contacting Patton for assistance 55 A Compliance information 58 B Specifications 60 C Cable Recommendations 64 D Well known port numbers 68 E Troubleshooting 70 ...

Page 4: ...15 Host 15 Session 15 Client Server 15 Acronyms 16 2 Getting started 17 Introduction 18 Unpacking the device server 18 Controls ports and indicators 19 Connecting the hardware 20 Connecting power 20 Connecting the device server to the network 21 Connecting the Ethernet cable Model 2232 only 21 Connecting to the wireless LAN Model 2211 only 21 Connecting to the serial device 22 Accessing the Consol...

Page 5: ...ntroduction 40 TCP Server Mode Operations 42 TCP Server Mode Configuration 43 TCP Client Mode Operations 44 TCP Client Mode Configuration 46 TCP Server Client Mode Operations 47 TCP Server Client Mode Configuration 49 6 Serial port configuration 50 Introduction 51 7 System administration 53 Introduction 54 8 Contacting Patton for assistance 55 Introduction 56 Contact information 56 Patton support ...

Page 6: ...2 Diagnostic LEDs 62 Environmental 62 Physical 62 Model 2211 62 Model 2232 62 Power 63 Model 2211 63 Model 2232 63 C Cable Recommendations 64 Ethernet pin outs Model 2232 only 65 Serial port pin outs 66 Ethernet wiring diagrams Model 2232 only 66 Serial wiring diagram 67 D Well known port numbers 68 Introduction 69 E Troubleshooting 70 Power LED Status Troubleshooting 71 Serial Console Troubleshoo...

Page 7: ...ple TeraTerm Pro 24 6 State Transition Diagram of TCP server mode 43 7 State Transition Diagram of TCP client mode 46 8 State Transition Diagram of TCP server client mode 48 9 Pin layout of the RJ45 connector 65 10 Pin layout of the DB 9 connector 66 11 Ethernet direct connection using crossover Ethernet cable 66 12 Ethernet connection using straight through Ethernet cable 67 13 RS 232 wiring diag...

Page 8: ...meters 32 5 IP configuration parameters 35 6 Input examples of allowed remote hosts 37 7 Device server TCP IP session modes 40 8 Host mode configuration parameters 40 9 Serial Port Configuration parameters 51 10 Pin assignment of the RJ45 connector for Ethernet 65 11 Pin assignment of DB 9 connector 66 12 Well known port numbers 69 ...

Page 9: ... on page 30 describes how to set up the wireless LAN connection Model 2211 only Chapter 4 on page 34 describes conﬁguring the IP address Chapter 5 on page 39 describes how to conﬁgure the operating session mode of the device server Chapter 6 on page 50 describes how to conﬁgure the serial port Chapter 7 on page 53 describes conﬁguring the system administration Chapter 8 on page 55 contains informa...

Page 10: ...al haz ard Strictly follow the instructions to avoid property damage The shock hazard symbol and CAUTION heading indicate a potential electric shock hazard Strictly follow the instructions to avoid property damage caused by electric shock The alert symbol and WARNING heading indicate a potential safety hazard Strictly follow the warning instructions to avoid personal injury The shock hazard symbol...

Page 11: ...parity 1 stop bit no ﬂow control The external power adaptor shall be a listed limited power source that incor porates a disconnect device and shall be positioned within easy reach of the operator The mains outlet shall be within 10 feet 3 meters of the device shall be easily accessible and protected by a circuit breaker Hazardous network voltages are present in WAN ports regardless of whether powe...

Page 12: ...or sec tion heading Clicking on the hyperlink jumps you to the reference When you have finished reviewing the reference click on the Go to Previous View button in the Adobe Acrobat Reader toolbar to return to your starting point Futura bold type Commands and keywords are in boldface font Futura bold italic type Parts of commands which are related to elements already named by the user are in boldfa...

Page 13: ...13 Chapter 1 Overview Chapter contents Introduction 14 Glossary 15 MAC address 15 Host 15 Session 15 Client Server 15 Acronyms 16 ...

Page 14: ...re cost effective single port serial Ethernet communication devices The Model 2211 see ﬁgure 1 connects to the network via 802 11b wireless transmission The Model 2232 see ﬁgure 2 connects to the network through an RJ 45 connector Both devices support RS 232 serial communications that enable vir tually any asynchronous serial device to be accessed over a network Figure 2 Model 2232 EtherBITS devic...

Page 15: ...ﬁne host as any computer that has full two way access to other computers on the Internet A host will have a speciﬁc local or host number that together with the network number forms its unique IP address Session A series of interactions between two communication end points that occur during the span of a single connection Typically one end point requests a connection with another speciﬁed end point...

Page 16: ...DHCP Dynamic Host Configuration Protocol SMTP Simple Mail Transfer Protocol FTP File Transfer Protocol PPP Point To Point Protocol PPPoE Point To Point Protocol over Ethernet HTTP HyperText Transfer Protocol DNS Domain Name Service DDNS Dynamic Domain Name Service SNMP Simple Network Management Protocol RADIUS Remote Access for Dial In User Service SSH Secure Shell NTP Network Time Protocol UART U...

Page 17: ...e device server to the network 21 Connecting the Ethernet cable Model 2232 only 21 Connecting to the wireless LAN Model 2211 only 21 Connecting to the serial device 22 Accessing the Console Port 22 Using the System console 22 Using remote console 23 Command usage 25 set Command 26 get Command 27 help Command 28 factorydefault Command 29 save Command 29 exit Command 29 reboot Command 29 ...

Page 18: ...meter values and status The following items are required to get started One DC power adapter included in the package One serial console cable for conﬁguration included in the package One RS 232 serial cable for connecting the RS 232 serial device One Ethernet cable One PC with network interface card hereafter NIC and or one RS 232 serial port Terminal emulation program running on the PC Unpacking ...

Page 19: ...ing Power Red when power is supplied Model 2232 E t h e r B I T S R S 2 3 2 S i n g l e P o r t D e v i c e S e r v e r Ethernet Reset Act Serial Rx Tx Serial Data Console Ready Power Link Power Model 2211 E t h e r B I T S W i r e l e s s 8 0 2 1 1 b R S 2 3 2 S i n g l e P o r t D e v i c e S e r v e r Act LED Link LED Serial Rx Tx LED Ready LED Power LED Act LED Link LED Serial Rx Tx LED Ready ...

Page 20: ...e between the Model 2232 and Ethernet hub or switch Model 2211 See section Connecting to the wireless LAN Model 2211 only on page 21 to connect the Model device server to the wireless LAN Connecting the device server to a serial device through serial data cable see Connecting to the serial device on page 22 Connecting power 1 Plug the DC power supply cable connector into the device server s Power ...

Page 21: ...lid connection to the Ethernet network as follows Link LED of the Model 2232 maintains solid green Act LED continuously blinks to indicate the incoming outgoing Ethernet packets If either of the above do not occur the Model 2232 is not properly connected to the Ethernet network Connecting to the wireless LAN Model 2211 only When power is connected correctly the Model 2211 will automatically search...

Page 22: ...d as the console port as well as the data port Remote console Remote users can make a telnet connection to the remote console port port 23 of the device server via a TCP IP network Both methods require the user to log into the device server in order to continue Using the System console 1 Connect one end of the console cable to the Serial port on the device server see ﬁgure 3 on page 19 2 Slide the...

Page 23: ...s except IP settings are set with factory default values help group CR If group is omitted shows this screen If group is specified shows set command usage of the group save CR Save changes exit CR Exit without rebooting the device reboot CR Exit and reboot the device From the command prompt screen users can set get and save conﬁguration parameter values using set get and save command Users also ca...

Page 24: ...l The target IP address and the port number should be those of the device server If required specify the port number as 23 Type the following command in the command line interface of your computer telnet 192 168 1 254 Or run a Telnet program with the parameters shown in ﬁgure 5 Figure 5 Telnet program set up example TeraTerm Pro 2 The user has to log into the device server Type the user name and p...

Page 25: ... serial admin or status If group is specified shows set tings of the group If group is omitted shows set tings of all groups Parameter value display help group CR Shows command usage screen If group is omitted shows help screen If group is specified shows set command usage of the group Help message display factorydefault option CR Restore factory default values If option is omitted all parame ters...

Page 26: ...bnet mask and the next indicates the default gateway IP address If users want to change only one of the parameters of the group users can omit trailing parameters and or can use to keep a parameter value The example below shows how to change subnet mask only without changing IP address and gateway IP address set ip static 255 255 0 0 OK Command usage of set will differ depending on the groups Each...

Page 27: ...IP_mode static IP_address 192 168 1 100 Subnet_mask 255 255 255 0 Gateway 192 168 1 1 status group is a special group where set command does not apply get status will display current system status as shown below example shows Model 2232 information get status Serial_no 2232 0207_test MAC_address 00 01 95 77 88 99 F W_REV V1 2 0 Current_IP 192 168 0 125 If group is omitted get command will show all...

Page 28: ...up CR group ip host serial admin or status If group is specified shows settings of the group If group is omitted shows settings of all groups help group CR If group is omitted shows this screen If group is specified shows set command usage of the group factorydefault option CR if option is omitted all parameters are set with factory default values if option ip all parameters except IP settings are...

Page 29: ...as follows for changes to take effect factorydefault or factorydefault ip OK save OK reboot save Command With save command current parameter changes are saved to non volatile memory Command usage of save command is as follows save CR Saved changes will be applied if the device server is rebooted by reboot command or manual rebooting exit Command With exit command current serial or remote console s...

Page 30: ...s LAN configuration Model 2211 only Chapter contents Introduction 31 Infrastructure Mode and Ad hoc Mode 31 Network Name SSID Service Set Identifier 31 Channel 31 Security 31 Settings 32 SSID 32 WEP1 32 WEP2 33 WEP Key 33 ...

Page 31: ...set using ASCII characters or hexadecimal hex numbers Channel The device server searches for all accessible 802 11b Wireless LAN channels periodically to ﬁnd other APs When the device server is ﬁrst booted up it searches for a preset AP default value is Default When the AP is found it accesses the AP automatically The device server will use the channel belonging to the network group in which it be...

Page 32: ...t Key Input Method Hexadecimal WEP Key 1234567890 Table 4 parameters are described in the following sections SSID Factory default value of SSID is Default User can change this value according to the SSID of his AP to be used If the value of SSID in device server is not changed from factory default value Default device server scans APs in the neighborhood and selects the AP that has the strongest s...

Page 33: ...ouble quotation mark to include space character type i infrastructure a AdHoc National_Code 1 USA 2 Canada 3 EU Australia 4 Spain 5 France 6 Korea 7 Japan 8 Others ch set channel number when adhoc mode WEP1 0 none 1 64bit 2 128bit WEP2 a ASCII type pass h Hexdecimal type pass WEP_Key ASCII type 5 64bit or 13 128bit character input Hexdecimal type 10 64bit or 26 128bit number input Note If the type...

Page 34: ...34 Chapter 4 IP address configuration Chapter contents Introduction 35 Static IP 35 Static IP configuration 36 DHCP 36 DHCP Configuration 37 IP Filtering 37 ...

Page 35: ...signed to a computer as a permanent address on the network Comput ers use IP addresses to identify and talk to each other on the network Choose a proper IP address which is unique and valid for your network environment A subnet represents all the network hosts at one geographic location in one building or on the same local area network When there is any outgoing packet over the network the device ...

Page 36: ...s the concept of a lease or amount of time for which a given IP address will be valid for a computer All the parameters required are assigned by the DHCP server and each DHCP client computer receives the proper network information at boot up To obtain an IP address the device server sends a corresponding DHCP request as a broadcast over the net work after each reset The reply generated by the DHCP...

Page 37: ...evice server Then the user must enter the IP address and subnet to be allowed for accessing To allow only a speciﬁc host to the device server enter the IP address of the speciﬁc host and just give 255 255 255 255 for the subnet To allow any hosts to the device server give 0 0 0 0 for both of the IP address and subnet Refer to table 6 for more details For example to allow only a 192 168 1 120 host ...

Page 38: ... IP address configuration set ip dhcp 192 168 1 120 255 255 255 255 OK save OK reboot 2 Static IP mode ip 192 168 161 5 subnet 255 255 0 0 gateway 192 168 1 1 set ip static 192 168 161 5 255 255 0 0 192 168 1 1 192 168 1 120 255 255 255 255 OK save OK reboot ...

Page 39: ...n Chapter contents Introduction 40 TCP Server Mode Operations 42 TCP Server Mode Configuration 43 TCP Client Mode Operations 44 TCP Client Mode Configuration 46 TCP Server Client Mode Operations 47 TCP Server Client Mode Configuration 49 ...

Page 40: ...client Select this mode when users want the device server to operate as a TCP client When the serial device sends data or pre defined timer is expired the device server tries to establish a TCP connection to a remote server through its TCP port If a TCP session is established between them the device server will send data to the server If there s any data from the server during the session it will ...

Page 41: ...nection state at all If the data transfer is completed the state is changed to this state if one of the host requests disconnection request If it is in TCP server mode the state is automatically changed to Listen mode It is a default start up mode when it is set as TCP client mode or TCP server client mode Sync Received In TCP server mode the state will be changed from Listen to Sync Received if a...

Page 42: ... Established which means a session is opened For a while data will be transferred between the hosts This is the Data state The session will be disconnected due to the request of one of them which is Closed state And then the state is automatically changed to its original state Listen 2 Operations Serial data transfer When a session has been established the device server reads the data from the ser...

Page 43: ...istening TCP port is the TCP port number through which remote host can connect a TCP session and send and receive data Incoming connection request to the ports other than Listening TCP Port will be rejected The device server does not restrict the number to a speciﬁc range but it is strongly recommended not to use the well known ports for certain application See Appendix D Well known Port Numbers T...

Page 44: ... host will be either Ethernet Serial communication devices acting as a TCP server or a socket program acting as a TCP server running on users PC 1 Typical State Transition Closed Sync Sent Established Data Closed At start up an initial TCP state is Closed If there is any incoming data through the serial port the device server will try to connect to a user deﬁned remote host Then the state will be ...

Page 45: ...ests will be rejected in TCP client mode Cyclic Connection If Cyclic Connection function is enabled the device server will make an attempt to connect to the user deﬁned remote host at certain interval even if there is no incoming serial data from the device If the remote host prepares certain data it will be transferred to the serial device via its serial port after the con nection is established ...

Page 46: ...7 State Transition Diagram of TCP client mode TCP Client Mode Configuration To conﬁgure the device server to work as a TCP client use set command as follows set host tcpc dest_ip dest_port cyclic_connection_interval inactivity_timeout CR where dest_ip destination IP address dest_port destination TCP port cyclic_connection_interval cyclic connection interval in minutes inactivity_timeout inactivity...

Page 47: ...mode set host tcpc 192 168 1 1 6001 10 300 OK TCP Server Client Mode Operations The 2211 works as either TCP server or client according to the situation This will be the typical mode for most applications since it will transfer the data either from serial port or from TCP port The default TCP state is Listen which is the same as that of TCP server mode 1 Typical State Transition Listen Sync Receiv...

Page 48: ...ed Guide 5 Host Mode configuration accept incoming connection request from remote host if the session is not established The detailed operation principles are the same as that of TCP server and TCP client mode Figure 8 State Transition Diagram of TCP server client mode ...

Page 49: ...on_interval inactivity_timeout where listening_port listening TCP port dest_ip destination IP address dest_port destination TCP port cyclic_connection_interval cyclic connection interval in minutes inactivity_timeout inactivity timeout in seconds Parameter deﬁnitions for TCP server and client mode conﬁguration are the same with TCP server mode and TCP client mode parameters The following example s...

Page 50: ...50 Chapter 6 Serial port configuration Chapter contents Introduction 51 ...

Page 51: ...ate as 7 data bits No parity 2 stop bit mode In case the 2211 is conﬁgured as 8 data bits Even or Odd parity 2 stop bits mode the 2211 will operate as 8 data bits Even or Odd parity 1 stop bit mode The factory default setting of the ﬂow control is None Only hardware ﬂow control using RTS CTS is sup ported by the 2211 Hardware ﬂow control method controls data communication ﬂow by sending signals ba...

Page 52: ... interval reaches to the time speciﬁed as inter character timeout Optimal inter character timeout would be different according to your application but at least it must be larger than one character interval within speciﬁed baud rate For example assume that the serial port is set to 1200 bps 8 Data bits 1 stop bit and no parity In this case the total number of bits to send a character is 10 bits and...

Page 53: ...53 Chapter 7 System administration Chapter contents Introduction 54 ...

Page 54: ...ure administrator username password and device name using set command as follows set admin username password devicename username login username password login password devicename device name The following example shows how to conﬁgure administrative parameters set admin adminuser adminpassword 2211_test1 OK ...

Page 55: ...on support headquarters in the USA 56 Alternate Patton support for Europe Middle East and Africa EMEA 56 Warranty Service and Returned Merchandise Authorizations RMAs 56 Warranty coverage 56 Out of warranty service 57 Returns for credit 57 Return for credit policy 57 RMA numbers 57 Shipping instructions 57 ...

Page 56: ...75 1007 Fax 1 253 663 5693 Alternate Patton support for Europe Middle East and Africa EMEA Online support available at http www patton inalp com E mail support email sent to support patton inalp com will be answered within 1 day Telephone support standard telephone support is available ﬁve days a week from 8 00 am to 5 00 pm CET 0900 to 1800 UTC GMT by calling 41 0 31 985 25 55 Fax 41 0 31 985 25 ...

Page 57: ... will be issued upon receipt and inspection of the equipment 30 to 60 days We will add a 20 restocking charge crediting your account with 80 of the purchase price Over 60 days Products will be accepted for repairs only RMA numbers RMA numbers are required for all product returns You can obtain an RMA by doing one of the following Completing a request on the RMA Request page in the Support section ...

Page 58: ...58 Appendix A Compliance information Chapter contents EMC Compliance 59 Radio and TV Interference FCC Part 15 59 CE Declaration of Conformity 59 ...

Page 59: ...nable protection from such interference in a commercial installation However there is no guarantee that interfer ence will not occur in a particular installation If the equipment causes interference to radio or television recep tion which can be determined by disconnecting the cables try to correct the interference by one or more of the following measures moving the computing equipment away from t...

Page 60: ...Serial interface 61 Network interface 61 Model 2211 61 Model 2232 61 Protocols 62 Model 2211 62 Model 2232 62 Security 62 Management 62 Diagnostic LEDs 62 Environmental 62 Physical 62 Model 2211 62 Model 2232 62 Power 63 Model 2211 63 Model 2232 63 ...

Page 61: ...EE802 11b Wireless LAN 11Mbps Frequency Band 2400 2485 MHz Channels Support US 11 1 11 ETSI 13 1 13 Korea 13 1 13 Operating Range Indoor 164 feet 50 meters at 11 Mbps Outdoor 984 feet 300 meters at 11 Mbps Radio Power US 0 021 Watts ETSI 0 01 Watts Korea 0 008 Watts Channel Spacing 5 MHz Operation Mode Infrastructure Ad Hoc Wired Equivalent Privacy WEP MD5 Auto Generate Hex or ASCII 64bits 128bits...

Page 62: ...anager Full featured system status display Diagnostic LEDs Power LED Ready LED Serial Rx Tx LED for data serial port Link LED for10Base T Act LED for 10Base T Environmental Operating temperature 32 to 131 F 0 to 55 C Storage temperature 25 to 151 F 4 to 66 C Humidity 90 Non condensing Physical Model 2211 Dimensions 3 22W x 4 48D x 1 02H in 82W x 114D x 26H mm Weight 10 6 ounces 300 g Model 2232 Di...

Page 63: ...Power 63 Models 2211 2232 Getting Started Guide B Specifications Power Model 2211 Supply voltage 9 0 30 VDC Supply current 300 mA at 9 VDC Model 2232 Supply voltage 7 5 15 VDC Supply current 140 mA nom ...

Page 64: ...64 Appendix C Cable Recommendations Chapter contents Ethernet pin outs Model 2232 only 65 Serial port pin outs 66 Ethernet wiring diagrams Model 2232 only 66 Serial wiring diagram 67 ...

Page 65: ...t and wire color Figure 9 Pin layout of the RJ45 connector The interconnecting cables shall be acceptable for external use and shall be rated for the proper application with respect to volt age current anticipated temperature flammability and mechanical serviceability Table 10 Pin assignment of the RJ45 connector for Ethernet Pin Description Color 1 Tx White with orange 2 Tx Orange 3 Rx White with...

Page 66: ...ctor Ethernet wiring diagrams Model 2232 only Figure 11 Ethernet direct connection using crossover Ethernet cable The interconnecting cables shall be acceptable for external use and shall be rated for the proper application with respect to volt age current anticipated temperature flammability and mechanical serviceability Table 11 Pin assignment of DB 9 connector Pin RS 232 1 2 Rx 3 Tx 4 DTR 5 GND...

Page 67: ...onnection using straight through Ethernet cable Serial wiring diagram Figure 13 RS 232 wiring diagram Rx 3 Rx 6 Tx 1 Tx 2 Rx 3 Rx 6 Tx 1 Tx 2 Model 2285 Hub Rx 3 Rx 6 Tx 1 Tx 2 Remote host Rx 3 Rx 6 Tx 1 Tx 2 Tx 3 Rx 2 RTS 7 CTS 8 DTR 4 DSR 6 Gnd 5 Device Server Rx Tx CTS RTS DSR DTR Gnd Serial device RS 232 ...

Page 68: ...68 Appendix D Well known port numbers Chapter contents Introduction 69 ...

Page 69: ...system processes or by pro grams executed by privileged users Table A 3 shows some of the well known port numbers For more details please visit the IANA website http www iana org assignments port numbers Table 12 Well known port numbers Port number Protocol TCP UDP 21 FTP File Transfer Protocol TCP 22 SSH Secure Shell TCP 23 Telnet TCP 25 SMTP Simple Mail Transfer Protocol TCP 37 Time TCP UDP 39 R...

Page 70: ...ts Power LED Status Troubleshooting 71 Serial Console Troubleshooting 71 Remote Console Troubleshooting 72 IP Address Troubleshooting 72 DHCP Troubleshooting 72 TCP Server Mode Operation Troubleshooting 73 Serial Communication Troubleshooting 73 ...

Page 71: ... server is not con nected to a wireless network Check your wireless configuration Problem Cause Action PowSerial console is not connected Invalid serial cable Be sure to use a serial console cable null modem cable for serial console Invalid serial port configu ration of terminal emulation program Check serial port configuration of terminal emu lation program 9600 bps 8 Data bits No par ity 1 stop ...

Page 72: ...oblem Cause Action Cannot find IP address of the 2232 Use serial console to find IP address Use EtherBITSManager program to probe the 2232 on the network Cannot find IP address of the 2211 2211 is disconnected from your Wireless network Use serial console to find IP address Use EtherBITSManager program to probe the 2211 on the network EtherBITSManager cannot probe the device server The device serv...

Page 73: ...alid IP address and TCP port number of the device server DSR option is set but DSR input is not high Disable DSR option or make DSR input of the device server high TCP connection with the other host is established already Close established TCP connection or connect later Problem Cause Action Serial data are not trans ferred by TCP IP immediately Too large inter character timeout Set inter characte...

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