DESCRIPTION
1-10
Document No.: COM-00-05-16 June 2006, Revised June 2014
Version: C.1
5.
Both WAG Serial Interface baud rates must match the baud rate of the serial device that it
is plugged into.
Once a Tunnel is established, serial data from any serial device(s) plugged into either WAG will be
sent to the serial device(s) plugged into the other WAG.
When a Tunnel is established, if the tunnel is dropped for some reason, the WAG will attempt to
re-establish the connection if the WAG is configured with a valid Serial Tunnel IP address and if
the WAG is still in RAW data mode.
1.6
OFFICE SYSTEM INTERFACE (OSI) FUNCTIONALITY
When used in an Office System Interface (OSI) application (see Figure 1-4), the WAG operates as a
message router between the office system and field devices operating on the LAN.
Refer to the diagram below for the following discussion.
Ethernet
Office
system
(WAMS)
WAG
SEAR II
Echelon
Other
devices
IP Network
Ethernet
Figure 1-4. Office Systems Interface
The SEAR II/SEAR IIi sends an ATCS message to the WAG consisting of a source address of type 7
and a destination address of type 2. The 7 indicates that the source is a field device and the 2
indicates that the destination is an office device.
The WAG will look at the codeline designation (LLL) portion of the source ATCS address and will
check its “Active route list” to determine whether it knows of any office device that is interested
in the ATCS messages.
