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Lantronix MSS100 Скачать руководство пользователя страница 38

Using the MSS

Interactive Connections

5-3

5.2.1 Outgoing Connections

The MSS can make outgoing connections to hosts on TCP/IP networks via its serial port.
It supports Telnet and Rlogin connections, and environment strings added to the connection
commands. See the Command Reference chapter of the Device Server Reference Manual
on the CD-ROM for more information.

5.2.1.1 Telnet

To start an outgoing Telnet session to a remote host on a TCP/IP network, type Telnet at
the Local> prompt, followed by either the host’s name or its numeric IP address.

Figure 5-1: Opening a Telnet Connection

Note:

If you have configured a preferred host, no host name is required.

You can also make a Telnet connection to a specific port number, as described in Serial
Tunnel on page 5-7.

5.2.1.2 Rlogin

Rlogin allows a user to log into a remote host as if he or she were a local user. In the
example below, shark is the remote host and lola is the username. Unless the username is
password protected, the user will be logged in normally.

Figure 5-2: Connecting with Rlogin

Note:

Because Rlogin can bypass the normal password/login sequence and
is therefore a potential security problem, it may be disabled on some
hosts. It is disabled by default on the MSS.

5.2.2 Session Control

When a user connects to a network service (via Telnet, Rlogin), a session is created. A user
can open several connections to various hosts at once, although only one is displayed on
the screen at a time. Each separate connection is a session. The following section explains
command used to manipulate sessions.

Local> TELNET 192.0.1.66

Local> RLOGIN shark “lola”

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Содержание MSS100

Страница 1: ... 8179 fax eu_sales lantronix com Pacific Rim 46 East Coast Road East Gate 10 01 Singapore 428766 65 447 4222 65 344 0614 fax asiapacsales lantronix com For More Information For more information on this product and all of the products and services provided by Lantronix please visit us at www lantronix com For immediate needs you may contact us directly at any of our corporate and regional headquart...

Страница 2: ...MSS Installation Guide For MSS100 Device Servers ...

Страница 3: ...ice pursuant to Part 15 of FCC Rules These limits are designed to provide reasonable protection against such interference when operating in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with this guide may cause harmful interference to radio communications Operation of this equipment in a residential area i...

Страница 4: ...ng the Serial Console 3 4 3 3 Incoming Logins 3 5 3 3 1 TCP IP Logins 3 5 3 3 2 Incoming LAT Logins 3 6 3 3 3 Serial Port Logins 3 6 3 3 4 Remote Console Logins 3 7 3 4 Outbound Connections 3 7 3 5 Logout 3 8 4 Configuration 4 1 4 1 Passwords 4 1 4 2 Protocol Configuration 4 2 4 2 1 TCP IP Configuration 4 2 4 2 2 IPX NetWare Configuration 4 4 4 2 3 LAT Configuration 4 6 4 3 Serial Port Configurati...

Страница 5: ...4 Multihost Mode 5 8 5 4 1 Enabling Multihost Mode 5 8 5 4 2 Adding Hosts 5 9 5 4 3 Removing Hosts 5 9 5 5 Modem Emulation Mode 5 9 5 5 1 Modem Mode Commands 5 10 5 5 2 Wiring Requirements 5 11 5 6 COM Port Redirector 5 11 A Contact Information A 1 A 1 Problem Report Procedure A 1 A 2 Full Contact Information A 1 B Troubleshooting B 1 B 1 Power up Troubleshooting B 1 B 2 DHCP Troubleshooting B 2 B...

Страница 6: ...D 1 Obtaining Software D 1 D 2 Reloading Software D 2 D 3 Troubleshooting Flash ROM Updates D 4 E Specifications E 1 E 1 Power Specifications E 1 E 2 Environmental Information E 1 Warranty Statement Declaration of Conformity Index ...

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Страница 8: ...s command line editing and command line recall An extensive Help facility is included The EZWebCon utility provided on the CD ROM allows you to configure the MSS from any host machine running the Java Virtual Machine JVM It also allows remote host logins into the MSS which are similar to Telnet and LAT logins The Lantronix ThinWeb Manager a set of HTML pages stored on the MSS allows you to configu...

Страница 9: ...eractive diagnostics help system managers troubleshoot network and serial line problems SDK Support The MSS supports the Lantronix Software Developer Kit SDK which allows users to customize the MSS and add functionality 1 2 Protocols A network protocol is a method of communicating over Ethernet Each protocol specifies a certain arrangement of data in the Ethernet packets and provides different ser...

Страница 10: ...local network connections and is supported on most DEC operating systems The MSS provides logins to remote hosts and host initiated connections as well as access to the MSS serial port from LAT hosts 1 3 Terms The following terms are used throughout this manual Host A computer attached to the network The term host is generally used to denote interactive computers or computers that people can log i...

Страница 11: ... Configuration contains additional configuration information Chapter 5 Using the MSS contains information about how the MSS can be used in different applications Read this chapter to get the most out of using the MSS in your situation Appendices include Contact Information Troubleshooting Pinouts Updating Software and Specifications Read them as necessary The comprehensive Index can be used to fin...

Страница 12: ... connector The following figure shows an MSS front panel Figure 2 1 MSS Front Panel The MSS rear panel has an RJ45 Ethernet connector a reset button and a power connector The following figure shows an MSS rear panel Figure 2 2 MSS Rear Panel Note When the reset button is pressed and held during the power up and boot procedures the MSS returns to its factory default configuration Serial DB25 Serial...

Страница 13: ...e serial devices as shown in the figure below Any device with a serial port can be connected to the network via an MSS Figure 2 3 MSS Network Layout Table 2 1 MSS LEDs LED Function Power Glows green when power is supplied to the MSS Link Glows green while the MSS is connected properly to a 10BASE T or 100BASE T Ethernet network 100 Glows green to indicate a 100BASE T Ethernet connection OK Blinks ...

Страница 14: ... Connect one end of a serial cable to the DB25 connector on the front of the MSS You may want to use a serial terminal for the first connection both to ensure that your server is working and to configure the necessary network set tings Note The serial port is initially set for 9600 baud 8 data bits one stop bit and no parity B Connect the other end of the cable to your serial device s serial port ...

Страница 15: ...e information on BOOTP RARP or DHCP refer to your operating system s documentation The MSS determines if the code in the Flash ROMs is valid If so it loads the code and begins normal execution This step takes approximately five seconds Once the unit is running normally the Power LED should be solidly lit to indicate the unit is ON the Link LED should be solidly lit to indicate a functioning Ethern...

Страница 16: ...port or logging into the remote console port does not automatically create privileged user status You must use the Set Privileged command to configure the unit see Privileged User Status on page 3 1 Only one person at a time may be logged into the remote console port port 7000 This eliminates the possibility of several people simultaneously attempting to configure the MSS Although passwords can be...

Страница 17: ...adme that was included with it Use the following steps to assign an IP address using the EZWebCon Expert Shell 1 Start EZWebCon Instructions for installing running and using EZWebCon can be found on the distribution CD ROM 2 From the Action menu select Assign IP Address 3 Enter or change the IP related settings A For Ethernet Address enter the number that appears on the bottom label of your MSS B ...

Страница 18: ... ARP table If there is no other entry beside the local machine ping another IP machine on your network to build the ARP table This has to be a host other than the machine on which you re working Use the following commands to ARP the IP address to the MSS and make the MSS acknowledge the IP assignment Figure 3 4 Entering ARP and Ping Windows Note There should be replies from the IP address if the A...

Страница 19: ...est if the download file name in the configuration file does not exist If this is the case create a file in the download path to get the BOOTP daemon to respond BOOTP and RARP are enabled by default on the MSS If you wish to disable them use the Change BOOTP Disabled and Change RARP Disabled commands To enable DHCP use the Change DHCP Enabled command 3 2 4 Using the Serial Console Connect a termin...

Страница 20: ...rogram BCP commands see the Troubleshooting appendix 3 3 Incoming Logins 3 3 1 TCP IP Logins 3 3 1 1 Web Browser Login and Configuration If your MSS has an IP address you can log into it using a standard web browser with Java enabled Simply type the MSS IP address or resolvable text name into the browser s URL Location field Figure 3 7 Sample Web Browser Login Once you have connected to the MSS yo...

Страница 21: ...k Rlogin is enabled by default To log into the MSS type rlogin followed by the MSS IP address Figure 3 10 An Rlogin Connection 3 3 2 Incoming LAT Logins To get an MSS login prompt when connecting from a LAT host use the command below Substitute the last six digits of the MSS hardware address for xxxxxx Figure 3 11 LAT Login 3 3 3 Serial Port Logins Attach a terminal to the serial port and press th...

Страница 22: ...ssword protection feature is enabled The default login password is access To specify a new login password use the Change Loginpass command and specify a new password of up to six alphabetic characters Figure 3 13 Changing the Login Password Note Default passwords may pose a security risk and should be changed as soon as possible This is especially true of the privileged password 3 4 Outbound Conne...

Страница 23: ...Logout Getting Started 3 8 3 5 Logout To manually log out of the MSS type Logout or Logout Port at the Local prompt or press Ctrl D Figure 3 15 Logging out of the MSS Local LOGOUT ...

Страница 24: ...and hold the Reset button while cycling power on the unit or enter the Initialize Factory command at the Local prompt Keep in mind that doing so will remove all custom configurations The full command set is discussed in detail in the Device Server Reference Manual 4 1 Passwords There are two types of passwords on the MSS privileged and login You must enter the privileged password to change most se...

Страница 25: ...ess is network and what portion is node number and allows the server to decide at connection time whether a given TCP IP host is part of the local network segment All hosts must agree on the subnet mask for a given network When you configure the MSS IP address a default subnet mask will be configured automatically This default subnet mask should work for most networks If your network is divided in...

Страница 26: ...e numeric addresses needed to make a connection To specify a domain name server use the following command Figure 4 4 Configuring a Nameserver A secondary nameserver can also be specified for use when the primary nameserver is unavailable See Change Nameserver in the Device Server Reference Manual for more information Note If the MSS cannot resolve a text host name use the numeric IP address The MS...

Страница 27: ...se the Delete IPSecurity command followed by the IP address that you want to remove 4 2 1 6 WINS If WINS is enabled the MSS will broadcast a WINS name announcement at boot time and answer broadcast WINS name queries Other hosts can locate the MSS this way The MSS will rebroadcast whenever its IP address or name changes To enable WINS enter the following command Figure 4 7 Enabling WINS 4 2 2 IPX N...

Страница 28: ...k Number When internal routing is enabled the MSS needs an internal network number that is unique on the network When addressing IPX packets to a file server devices use the file server s internal network number as the destination address The internal network number for the MSS is a four byte number that defaults to the last four bytes of the unit s Ethernet address for example a3001234 It is unli...

Страница 29: ...host will check the service groups to which both the requester and the service belong If any group number is common to both the connection attempt will continue If not access will be denied The Change LAT Groups command establishes group numbers for the MSS and its serial port Figure 4 11 Changing Service Groups Note Each time the Change LAT Groups command is entered the previous group list is rep...

Страница 30: ... port will wait for a carriage return before starting a connection When the Autostart option is enabled the MSS will establish a connection as soon as it boots or if modem control is enabled as soon as the DSR signal is asserted To control this feature enter the Change Autostart command Figure 4 14 Enabling Autostart A port set for Autostart will never be idle and therefore will not be available f...

Страница 31: ...p Bits The default character size of 8 data bits can be changed to 7 data bits Similarly the default stop bit count of 1 bit can be changed to 2 bits Parity is normally None but can also be Even Mark Odd or Space To change these parameters use the following commands Figure 4 18 Configuring Serial Port Parameters Note If the MSS is set to 8 bit characters parity must be set to none 4 3 5 Flow Contr...

Страница 32: ... when enabled Note Modem Emulation Mode in which the MSS acts like a modem and only accepts AT modem commands is discussed in Chapter 5 After configuring modem related settings refer to the Modem Configuration Checklist on page B 4 4 3 6 1 Modem Control If a connection has ended the MSS should be able to log out the port and prepare to accept a new connection Similarly if no connection is open the...

Страница 33: ...en this occurs using the Change DSRLogout Enabled command This also prevents users from accessing other sessions by switching physical terminal lines Figure 4 22 Enabling DSRLogout 4 3 6 4 DTRWait Spurious characters from the attached serial device may be interpreted as a login attempt which could cause the port to be unavailable for network connections To avoid this behavior the MSS uses the Data...

Страница 34: ...60s produces the same results Figure 4 25 Enabling Timed Inactivity Logout 4 3 8 Preferred Port Host A default host for a port can be defined using the Change Preferred command The MSS attempts to use the preferred host for connections when no host name is specified in a connection command Figure 4 26 Defining a Preferred Service 4 3 9 Dedicated Port Host A dedicated host can also be defined for a...

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Страница 36: ...host Mode on page 5 8 Making the MSS look like a modem so that it can be used with existing communications software see Modem Emulation Mode on page 5 9 Using the Lantronix COM Port Redirector software to redirect PC COM ports see COM Port Redirector on page 5 11 5 1 Incoming Connections 5 1 1 Socket Connections Each node on a network has a node address and each node address can allow connections ...

Страница 37: ...P IP Socket Connections The MSS supports TCP IP socket connections to ports 2001 and 3001 To specify a connection to a socket use the Telnet command followed by the MSS IP address or resolvable name and the desired socket number Do not add spaces Open a TCP session to port 3001 to form a raw TCP IP connection to the serial port Use port 2001 when you need Telnet IAC interpretation 5 1 2 Host Appli...

Страница 38: ...specific port number as described in Serial Tunnel on page 5 7 5 2 1 2 Rlogin Rlogin allows a user to log into a remote host as if he or she were a local user In the example below shark is the remote host and lola is the username Unless the username is password protected the user will be logged in normally Figure 5 2 Connecting with Rlogin Note Because Rlogin can bypass the normal password login s...

Страница 39: ...ugh current sessions You can think of a user s open sessions as a list from the earliest to the most recently created Forward refers to a more recent connection while Backward refers to a session started earlier The list is also circular going forward from the most recently created session takes you to the earliest session and going backward from the earliest session resumes the most recent sessio...

Страница 40: ...Both commands can affect any active sessions not just the current session 5 2 2 4 Session Limits The number of active sessions a user can have on the MSS is limited by three factors available server memory resources a server wide limit and a port specific limit The absolute maximum number of sessions for the MSS is eight To reduce the limit further enter the Change Session Limit command followed b...

Страница 41: ...ed loadhost and startup file name 5 2 3 5 Show Server Characteristics Show Server Characteristics displays network related server identification information including the MSS hardware address node address IP address domain any configured gateways and nameservers and the subnet mask In addition it shows inactivity and retransmission limits password restrictions and the types of incoming logins perm...

Страница 42: ...NONE Local CHANGE AUTOSTART DISABLED Note If the Servers are on different IP subnets configure the default gateway on each unit with the Change Gateway command The above commands create a raw 8 bit clean TCP connection between the serial ports of the two MSS s once the units have been power cycled The commands for MSS_A ensure that it will automatically connect to MSS_B each time it is booted The ...

Страница 43: ... important things to note about multihost connections The MSS attempts to send data in the order it is received That is it reads in and sends data from one host before reading in data from another host The MSS will ping TCP and UDP hosts before sending connect attempts to make sure the remote hosts are alive If they are alive the MSS connects for real and passes the data If not the MSS will retry ...

Страница 44: ...AT style modem commands and handles the modem signals correctly Instead of making phone calls this mode provides network connections to remote machines Normally there is a modem connected to a PC and a modem connected to some other remote machine A user must dial from his PC to the remote machine and accumulate phone charges for each connection With the MSS in modem mode you can replace your modem...

Страница 45: ...TART CHARACTER A Local LOGOUT PORT 1 Table 5 1 Modem Mode Commands Command Function AT Help gives list of valid AT commands ATDT ipaddress Forms a TCP connection to the specified host Two IP address formats are allowed The first uses periods while the second omits periods and adds zeroes to segments less than 3 characters long Ex ATDT 192 0 55 22 3001T Ex ATDT 192000055022 Users can specify socket...

Страница 46: ... MSS in modem mode The serial device s DTR goes out to BOTH its own DSR in and the MSS DSR in When the device asserts its DTR it will see its DSR asserted That way the device thinks that the modem the MSS is ready to accept commands all the time and the MSS can close the network connection when the device disconnects The MSS DTR out goes to the serial device s CD in That way the MSS can signal the...

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Страница 48: ...uration including the information from a Netstat command Description of the problem Debug report stack dump if applicable Status of the unit when the problem occurred please try to include information on user and network activity at the time of the problem A 2 Full Contact Information Address 15353 Barranca Parkway Irvine CA 92618 USA Phone 949 453 3990 Fax 949 453 3995 World Wide Web http www lan...

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Страница 50: ...Error Messages Problem Message Error Remedy The MSS is connected to a power source but there is no LED activity The unit or its power supply is damaged Contact your dealer or Lantronix Technical Support for a replacement The MSS is unable to complete power up diagnostics This generally indicates a hardware fault One of the LEDs will be solid red for three seconds followed by one second of another ...

Страница 51: ...e from a network host If the OK LED blinks rapidly the Flash ROM code may be corrupt Reboot the unit If you get the same message you will need to reload Flash ROM See Reloading Software on page D 2 If you did not request a TFTP boot the flash ROM code is corrupt The unit will remain in boot mode Table B 2 DHCP Troubleshooting Area to Check Explanation DHCP is enabled on the MSS Use the Change Serv...

Страница 52: ...y the complete pathname for the download file in the BOOTP configuration file or add a default pathname to the download filename The MSS and host are in the same IP network Some hosts will not allow BOOTP replies across routed IP networks Either use a host running a different operating system or put the MSS in the same IP network as the host Table B 4 RARP Troubleshooting Area to Check Explanation...

Страница 53: ... done with the ats0 1 command The modem should not be configured to answer the phone unless the MSS asserts DTR MSS Modem control must be enabled Using modems on ports without modem control enabled will lead to security problems The MSS Autobaud feature should be enabled only when required B 6 Entering Commands at the Boot Prompt If the Boot prompt appears on the serial console instead of the Loca...

Страница 54: ...er including the unit s IP address Flash This command will force the MSS to download new operational code and reload it into Flash ROM This is necessary when a new version of software is released and you wish to upgrade your unit If the server cannot download the file the code in Flash ROM will still be usable Help Displays a one page summary of available commands and what they do Change Bootgatew...

Страница 55: ...hree numbers will be supplied automatically The Ethernet address should have been set at the factory Setting an incorrect address could cause serious network problems Change IPAddress ip_address Specifies this server s IP address Uses the standard numeric format Change Loadhost ip_address Specifies the host to attempt to load the file from The IP address should be in standard numeric format no tex...

Страница 56: ... the user For more information see Appendix D TCP IP users must use the Software option to specify the loadhost the loadfile and their own network address TFTP users can specify a complete path name up to 31 characters if the file is located in a directory other than the default The case of the filename must match that of the filename loaded onto the host computer Show Server Use this command when...

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Страница 58: ...he MSS RJ45 Ethernet connector pin connections Figure C 1 RJ45 Ethernet Connector C 2 MSS Serial Connector C 2 1 DB25 Connector The figure below shows the pin connections of the MSS DB25 connector Figure C 2 DB25 Serial Connector 1 2 3 4 5 6 7 8 1 RX 2 RX 3 TX 6 TX TX out RX in RTS out CTS in DSR in DTR out 1 14 GND CD in Shield PWR GND 5V DTE DB25 Male 13 25 ...

Страница 59: ... DSR acts like CD In this case the modem s DSR pin may be wired to the Server s DSR pin C 2 2 2 DTR Data Terminal Ready The MSS normally asserts DTR When modem control is enabled on the MSS the server will de assert DTR for three seconds each time the port is logged out and each time a user disconnects from a modem service The modem must be configured to hang up and recycle when DTR is de asserted...

Страница 60: ...on the Lantronix FTP server ftp lantronix com Most of these files are binary data so the binary option must be used to transfer the files All released files are in the pub directory Always download the README file in the pub directory before downloading anything else it contains a list of available software files To log into the FTP server enter a username of anonymous and enter your full email ad...

Страница 61: ...ng the download attempts The MSS will then try TFTP NetWare and MOP booting in that order provided that it has enough information to try each download method Downloading and rewriting the Flash ROM will take approximately two minutes from the time the Initialize command is issued If the download file cannot be found or accessed the MSS can be rebooted with the code still in Flash ROM The OK ACT LE...

Страница 62: ...re file server The MSS cannot actually log into the file server since it knows no username password it can only access files in the login directory itself On the MSS specify the file server name filename and path Figure D 3 Configuring NetWare Reload D 2 1 3 MOP The MSS100 SYS filename is the only parameter that the MSS needs to reload via MOP Make sure the service characteristic is enabled on the...

Страница 63: ...ted access to the NetWare server directories TFTP Check the file and directory permissions Ensure the loadhost name and address are specified correctly and that their case matches that of the filenames on the host system Ensure the file and pathnames are enclosed in quotes to preserve case Ensure that TFTP is enabled on the host several major UNIX vendors ship their systems with TFTP disabled by d...

Страница 64: ...aximum E 2 Environmental Information E 2 1 Temperature Limitations Operating range 5 to 50 C 41 to 122 F Storage range 40 to 66 C 40 to 151 F Max temp change 20 C 36 F per hour Rapid temperature changes may affect operation Do not operate the MSS near heating or cooling devices large windows or doors that open to the outdoors E 2 2 Relative Humidity Limitations Operating range 10 to 90 noncondensi...

Страница 65: ...ecifications E 2 E 2 3 Altitude Limitations Operating 2 4 km 8 000 ft Storage 9 1 km 30 000 ft When operating the MSS above 2 4 km 8 000 ft decrease the operating temperature rating by 1 8 C for each 1 000 m 1 F for each 1 000 ft ...

Страница 66: ...xisting contract between the parties Any such contract states the entire obligation of Lantronix The contents of this document shall not become part of or modify any prior or existing agreement commitment or relationship The information recommendation description and safety notations in this or other documents sup plied by Lantronix are based on general industry experience and judgment with respec...

Страница 67: ...est IEC 6100 4 4 1995 Electrical Fast Transient Test IEC 6100 4 5 1995 Power Supply Surge Test IEC 6100 4 6 1996 Conducted Immunity Test IEC 6100 4 8 1993 Magnetic Field Test IEC 6100 4 11 1994 Voltage Dips Interrupts Test L V D Directive 73 23 EEC Supplementary Information This product has been verified as being compliant within the Class A limits of the FCC Radio Frequency Device Rules FCC Title...

Страница 68: ...vice 4 11 Defaults restoring B 5 DHCP 1 1 3 4 B 2 B 6 D 2 Troubleshooting B 2 Displaying current settings B 7 Domain name 1 1 Domain name server DNS 1 2 Download file B 3 DSR Data Signal Ready 4 7 4 10 B 4 DSRLogout 4 10 DTR Data Transmit Ready 4 10 B 4 DTRWait 4 10 E Encapsulation 4 4 Ethernet Address B 6 Ethernet connector C 1 Ethernet port 2 1 EZWebCon 1 1 3 2 3 6 F Factory defaults B 5 Flash D...

Страница 69: ... Circuit timer 4 6 Identification 4 6 Service groups 4 6 LEDs 2 1 2 2 2 4 B 1 Link LED 2 2 Loadfile B 7 Loadhost 4 5 B 6 Local host table 4 4 Local mode 1 3 Local prompt 1 3 3 4 3 8 4 11 B 2 Login 3 5 EZWebCon 3 6 Password 3 7 Remote console 3 7 Rlogin 3 6 Serial port 3 6 Telnet 3 6 Web browser 3 5 Logout 3 8 4 11 M Modem Configuration checklist B 4 Control 4 7 4 9 DTRWait 4 10 Wiring C 2 modem em...

Страница 70: ...g B 3 Rebooting B 5 Reloading software 1 2 B 5 D 2 MOP D 3 NetWare D 3 TCP IP D 2 Remote console 1 2 3 1 3 7 Restoring defaults B 5 RJ45 2 1 C 1 Rlogin 1 1 3 6 Routing NetWare 4 4 RTS CTS 4 8 S SDK 1 2 Security 1 2 Serial Access mode 4 7 Dedicated port service 4 11 Flow control 4 8 Modem control 4 7 Modem signals 4 9 Port 3 6 4 7 Port parameters 4 8 Preferred port service 4 11 Prompts 4 11 Serial ...

Страница 71: ...1 3 6 Temperature limitations E 1 TFTP D 2 ThinWeb Manager 1 1 3 5 Troubleshooting B 1 B 7 BOOTP B 3 DHCP B 2 Flash software updates D 4 Modems B 4 Power up B 1 RARP B 3 Tunnel serial 5 7 U UDP 1 2 5 7 Updating software D 1 W Web browser interface 1 1 3 5 WINS 4 4 Wiring modem C 2 ...

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