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2.1.2
TCP/IP
2.1.2.1
Overview
The network capabilities are achieved by a using different layers of connections. Every layer of connections provides basic
connections to the layer above it. The higher the layer is, the more capabilities it can provide.
Terminal
AT Commands
The three layers of connections are:
• Physical links
• Point-to-point links
• TCP/UDP links
2.1.2.2
Features and Benefits
The TCP/UDP IP feature provides the terminal with the following benefits:
• Up to 4, simultaneous protocol connections.
• Ability to pass data via the protocol stack using AT commands (command mode). This relieves the terminal from switching
the RS232 to "binary mode" and back to "command mode".
• Ability to use UDP and TCP simultaneously.
• No need for protocol support from the terminal - only data sending and receiving.
• Reduced memory utilization. g20 manages the protocol stack and therefore saves terminal memory.
98-08901C68-O
TCP/UDP IP
Connection
RS232
g20
Figure 1. System Overview
Internet Site
www...
World Wide
Web
GSM/
Gateway
GPRS
GPRS
PPP Connection
Signaling
Product Features
5
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