Hardware manual

80-001113 SysLINK Administrator’s Guide Page 7
Configuring Modem Emulation on a Serial Port
The gateway can be configured to allow legacy devices that interact with external modems
to communicate over a TCP/IP network instead of a phone line. When modem emulation is
enabled, the gateway will respond to AT commands generated by the attached device. After
receiving the dial command, the gateway will make a TCP connection to the specified host,
optionally translating the phone number into a TCP host and port. The gateway will also
accept incoming TCP/IP connections and generate the appropriate response codes. Each
Systech serial port accepts incoming TCP connections on two TCP ports: an 8000-series port
(for raw data), and a 9000-series port (for telnet data).
To enable modem emulation:
1. Configure the correct serial parameters on the serial port (see Serial Settings)
2. Enable modem emulation (see Port Services)
3. Optionally configure phone number to host/port pair translation (see Phone
Number Translation)
4. Configure connection protocols for the target host(s) (see Protocol Settings)
Once modem emulation is enabled, verify correct operation by connecting a terminal to the
appropriate serial port and issuing an 'AT' command. If the gateway returns the 'OK' result
code, modem emulation is now functioning properly. You may now establish an outgoing
connection with the 'ATD' command (see Phone Numbers for more information on IP
address formats).
Configuring Outgoing Network Connections on a Serial Port
The gateway can be configured to initiate TCP connections to remote hosts from a serial
port. This connection can be configured for a variety of host protocols. It is generally used
when the gateway must initiate the network connection to the remote host.
This option can provide telnet logins for terminals attached to the gateway, or it can
establish raw data paths for other serial devices. To configure a port for outgoing TCP
network connections:
1. Configure the correct serial parameters on the serial port (see Serial Settings)
2. Configure the desired TCP protocol parameters (see Port Services)
3. Configure connection protocols for the target host(s) (see Protocol Settings)