Digi W manual D e m E m u l a t i o n, Modem Emulation Digi One TS and PortServer TS 2/4 MEI only

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Chapter 9

M o d e m E m u l a t i o n

Modem Emulation (Digi One TS and PortServer TS 2/4 MEI only)

Modem emulation enables a system administrator to configure a networked Digi device server to act as a modem. The Digi device server emulates modem responses to a serial device and seamlessly sends and receives data over an Ethernet network instead of a PSTN (Public Switched Telephone Network). The advantage for a user is the ability to retain legacy software applications without modification and use a less expensive Ethernet network in place of public telephone lines.

To use a Digi device server for modem emulation, do the following:

•use a cable with the correct wiring pinouts (see "Modem Emulation Cable Signals" on page 34)

•configure the serial ports and device type with the Web Interface

Note: Before AT commands are accepted, DSR must go high on the Digi device server.

Common User Scenarios

The Digi device server in modem emulation mode allows for the easy replacement of modems in almost any environment where there is a LAN or WAN.

User Scenario-Diagram A

Workstation

Ethernet

Serial cable	#1
	Digi One TS

Server 192.168.25.5

In Diagram A, the Digi One TS replaces a modem connected to a workstation running an application. The Digi One TS allows for the use of software applications without modification by responding to all the AT commands configured in the workstation application. The Digi One TS connects to the IP Address of the server when an

ATDT ipaddress:port (ATDT 192.168.25.5:50001) command is issued. Once the remote device establishes the TCP connection, a CONNECT message is sent to the serial port and only then does the Digi device server switch from AT command mode to data mode. Using the modem escape sequence or dropping DTR on either side terminates the connection. A DISCONNECT message will be sent to the

Chapter 9 Modem Emulation

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Contents Digi TS W Family 9000329B Configuring the IP Address Chapter Configuring WirelessN t e n t s Chapter IntroductionConfiguring the Serial Ports Setting Up RealPortChapter Configuring PPP Chapter Configuring AutoconnectionConfiguring Security Features Configuring IP RoutingConfiguring DNS Configuring the Digi Device for IAIndustrial AutomationConfiguring Snmp Configuring UsersReference and Certifications Configuring Power Over the Serial PortsContents T r o d u c t i o n Setup OverviewSupported Devices About Entering Commands on the Command LineAbout This Guide Other Documents in the LibraryAbout Configuration Methods Configuration Prerequisites N f i g u r i n g W i r e l e s s Configuration ConsiderationsSelect Discover Digi Device from the CD Configuring Wireless Configuring Wireless Configuring Wireless Configuring Wireless N f i g u r i n g t h e I P a d d r e s s Options for Configuring the IP Address and MaskConfiguring the IP Address Using ARP-Ping Configuring the Ethernet Interface from the Command Line Configuring an IP Address using Dhcp and Rarp About RealPort T t i n g U p R e a l P o r tSetting Up RealPort Configuring the Serial Port Settings with the Web Interface Options for Configuring the Serial PortsConfiguring the Serial Port Settings from the Command Line N f i g u r i n g P P P Configuring Inbound PPP ConnectionsConfiguring Outbound PPP Connections Command Line Configuring Inbound PPP Connections ExampleProcedure Sample Use the following table for additional configurations Configuring PPP D e m E m u l a t i o n Modem Emulation Digi One TS and PortServer TS 2/4 MEI onlyCommon User Scenarios Serial Device Digi Device Server Modem Emulation Cable SignalsApplication AT Com Digi Device Server Response Mand Originating, Answering, and Disconnecting CallsServer. P represents a one second pause Code Modem Emulation AT Command Set Function ResultATP Function ResultATXn Accepted but ignored There is no Nvram support currently AT+MS Ascii Registers Function Range Units Saved DefaultRegister Function Range Units Saved Default Register Function Range Units Saved Default 17 11h =XON/XOFF &K4 Result Codes Short Long Form Modem Emulation Commands for Configuring Autoconnection by Port or by User Configuring a Port for Autoconnection Web InterfaceConfiguring a User for Autoconnection Web Interface N f i g u r i n g a u t o c o n n e c t i o nConfiguring UDP Multicast Configuring TCP Socket CommunicationClick Serial Ports Click Change ProfileClick Change Profile and select UDP Socket Configuring Autoconnection N f i g u r i n g I P R o u t i n g Configuring Static RoutesConfiguring Dynamic Routes Using RIP Configuring Proxy ARP Configuring IP Routing Controlling Access to the Configuration Controlling Access to Inbound PortsN f i g u r i n g S e c u r i t y F e a t u r e s Controlling Access to the Command Line Controlling Access to Outbound PortsIssuing User Passwords Configuring SSH Version 2 for Secure CommunicationDevice Required Hardware Firmware Http Controlling Access to ServicesSnmp SSH Configuring Security Features Configuring the User-Defined Protocol Configuring ModbusConfiguring the Digi Device for IA Industrial Automation About the Domain Name System N f i g u r i n g D N SConfiguration Procedures About Snmp and the Device Server Agent N f i g u r i n g S N M PMIB Configuration Procedure Web InterfaceCommon User Features About Configuring UsersFeature Description Set user Field N f i g u r i n g U s e r sConfiguring a User Web Interface Commands for Configuring a UserClick New User Upgrading the Firmware Copying the Configuration to and from a Remote HostResetting Device Server Configuration to Defaults Commands for Resetting the Configuration to Defaults Managing the OS and Configuration Configuring RI Power Serial Power FeatureConfiguring DTR Power DTR on DTR OFF Serial Power TableConfiguring Power Over the Serial Ports F e r e n c e a n d C e r t i f i c a t i o n s Interpreting the LEDsColor State Indicates RJ-45 Pinouts EIA-232 EIA-422/485 EIA-485 Half Full-Duplex Environmental CertificationsDigi Contact Information Digi Contacts Reference and Certifications