Motorola 68P02958C00-B - Manual (Page 241)

6-6
Adding Terminal Server Ports
General
The IP Gateway supports on board 4 ports for MDLC communication. In case more ports are
required for MDLC communications external hardware is needed. The Standard hardware for
Ports extensions is a Terminal Server.
The Terminal Server has an Ethernet port and many RS232 ports. It conveys communication
traffic from IP to the RS232 ports and the other way around.
The IP Gateway establishes a connection to the Terminal Server over the LAN and establishes
IP sessions for each RS232 port that’s utilized for MDLC communication. The connection
remains opened even if there is no data to transmit/receive. Every connection is associated
with an IP address (of the Terminal Server) and a TCP port id (associated with the specific
RS232 port in that specific Terminal Server).
IP Gateway is designed to support up to 32 ports connected to one or more Terminal Servers.
IP Gateway is designed to be able to communicate with any TCP\IP Terminal Server that is
implemented over TELNET. The IP Gateway was tested with several Terminal Servers. In this
book we will elaborate the use of Equinox Terminal Servers.
IP Gateway Site Configuration and Terminal Server configuration must be defined in order to
support external Terminal Server ports.
•
The maximum number of ports connecting to RTUs in the network is 32.
•
The IP Gateway can work with up to 32 Terminal Server IP addresses.