Motorola V186 - Cell Phone - GSM System Planner Manual page 116

RS-232
STS
STS
The STS can communicate with remote RTUs over IP using the Tetra infrastructure. The
PC running the STS is connected to the Tetra radio (e.g. MTH500 radio) or to the RTU.
For this purpose, the PC should have a Tetra PD installation (as specified in the CPS user
manual).
After setting up the connection, the user should run the STS Communication Setup
utility, select Ethernet port and specify in a focal point RTU/IP Gateway IP Address
under 'Local Site IP Address'.
It is important to note that RTU to RTU communication is routed through the
infrastructure LAN system and not directly.
Note that a paging mechanism to each site (peer) in IP conversion table makes MDLC
over IP more reliable. For details, see MDLC over IP Site Paging.
Tetra does not support group calls (RTU-to-RTU broadcasts). To send a frame to a group
of sites, the application should send to each site individually, leaving a short wait time
between each transmission (about 300 milliseconds).
SCADA
Central
Ethernet
LINE 1
IP
Gateway
LINE 1
Tetra
MTP700
radio
RTU-A
RS-232
112
IP
Routing
Net
Tetra
Infrastructure
SW MI
Tetra
MTP700
radio
RTU-B
Communications