MDS 05-3438A01, Rev. F MDS 4790/9790 Series I/O Guide 3
a transceiver board causes the boards to communicate
briefly with each other to establish which board will operate as the
active board and which operates as the stand-by. For more information,
refer to “Transceiver Board and Power Supply Assemblies” on Page 86.
2.3 Applications
The MDS 4790/9790 Series radios are designed for point-to-multipoint
data transmission in oil and gas pipeline communications, transactional
systems, and telecommunications systems. A MAS network provides
communications between a central host computer and remote terminal
units (RTUs) or other data collection devices. The operation of the radio
system is transparent to the computer equipment.
Basic MAS Master Station Operation
Figure 2 shows a typical point-to-multipoint system using an
MDS 4790/9790 Series master station. This is a basic system consisting
of a central master station and several associated remote units.
Figure 2. Typical MAS Network
Repeater and Polling Remote Operation
A MAS system using repeater and polling remote radios is shown in
Figure 3 on Page 4. Notice that the polling remote radio operates in
half-duplex mode and the repeater operates in full-duplex mode. Con-
figuring the radio for repeater operation is as simple as typing REPEATER
ON
with a PC connected to the rear panel diagnostic port. Refer to
“DIAGNOSTICS AND CONTROL” on Page 30 for details.
–
I
D
IA
G
13
.
8
VDC
P
W
R
+
–
HOST SYSTEM
REMOTE RADIO
SWC OFF
RTU
RTU
RTU
RTU
–
I
DI
A
G
1
3.8 V
D
C
PW
R
+
–
–
I
DI
AG
13.8
V
DC
P
WR
+
–
–
ID
I
AG
1
3
.8 VDC
P
W
R
+
–
–
I
D
IAG
13.8 V
D
C
PW
R
+
–
RTU
MDS MASTER
STATION
CONTINUOUSLY
KEYED
REMOTE RADIO
SWC OFF
REMOTE RADIO
SWC OFF
REMOTE RADIO
SWC OFF
REMOTE RADIO
SWC OFF
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