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Chapter Three
Operation
Page 49 November
2008
17.
Ensure both the username and the password are entered exactly as configured in D2 W
MDME 2400. (When booted in SETUP mode, the PPP server has username “user” and
password “user”).
3.13.2 Serial Gateway.
Serial gateway functionality is available for both RS232 and RS485 ports independently, and
enables serial data to be routed via the wired or wireless network connection. Serial gateway
functionality is similar to radio modem functionality, allowing point-to-point and multipoint serial
data transfer.
Each D2 W MDME 2400 serial port may be configured as Server, Client, or Multicast Group.
When configured as Server, the module will wait for a connection to be initiated by a remote client.
When configured as Client, the module will automatically attempt to connect to the specified
remote server. When configured as Multicast Group, the module will broadcast data to all members
of the same Multicast Group.
Some of the possible serial gateway topologies are illustrated below. As you can see, it is possible
for serial data from a D2 W MDME 2400 to be transferred to one or more D2 W MDME 2400
serial ports, or to be encapsulated within a TCP/IP socket for availability on an Ethernet network.
Conversely, data encapsulated in a TCP/IP socket can be reproduced at a D2 W MDME 2400 serial
port. Both D2 W MDME 2400 serial ports and the hard-wired Ethernet port can be in use at the
same time.
Access
Point
Client
RS232
Server
RS232
Client
RS232
Device
RS232
Device
RS232
Server
RS485
Client
RS485
Device
RS232
Device
Client
Access
Point
RS232
Server
LAN
PC Running Telnet
or SerialIP
Client
Access
Point
Client
RS232
Device
RS485 Multicast
Group
RS232 Multicast
Group
Client
RS232
Device
RS485
Device
Client
RS485
Device
Access
Point
RS485 Multicast
Group