Antenna Swr Check; Data Buffer Setting-Modbus Protocol; Hoptime Setting; Totalflow™ Protocol At 9600 With Sleep Mode - GE TransNET 900 Reference Manual

Antenna SWR Check

It is necessary to briefly key the transmitter for this check by placing the radio
in the mode
SETUP
radio, enter
DKEY
operation, enter
Q
The SWR of the antenna system should be checked before the radio is put into
regular service. For accurate readings, a wattmeter suited for 1000 MHz is
required. One unit meeting this criteria is the Bird Model 43 directional watt-
meter with a 5J element installed.
The reflected power should be less than 10% of the forward power
(2:1 SWR). Higher readings usually indicate problems with the antenna,
feedline or coaxial connectors.
Data Buffer Setting—Modbus Protocol
The default setting for the data buffer is
with the lowest possible latency and improves channel efficiency. MODBUS
and its derivatives are the only protocols that should require the buffer to be
turned on. See "BAND [A, B, C]" on Page 30

Hoptime Setting

The default hop-time setting is
seconds can be used to increase throughput, but at the cost of increased
latency. A detailed explanation of the
Page 34.
TotalFlow™ Protocol at 9600 with Sleep Mode
For reliable operation with TotalFlow meters, use the default settings for
9600 with the following alterations:
HOPTIME 28
—Improves store-and-forward performance for a large contin-
FEC OFF
uous data stream
—Ensures "ungapped" 4-second polls if unit in sleep mode
BUFF ON

Operation at 115200 bps

Burst throughput at 115200 bps is supported at all settings. The radio will
always buffer at least 500 characters. Sustained throughput at 115200 bps is
only possible when the data path is nearly error-free and the operating settings
have been properly selected. For sustained operation at 115200 bps, use the
following settings:
MDS 05-2708A01, Rev. F
(Page 40) and using the
; to disable the
SETUP
or .)
QUIT
(7 ms). Alternate settings of
7
—Allows large data packets
,
SAF OFF FEC OFF
MDS TransNET Ref. Manual
command. (To unkey the
KEY
mode and return the radio to normal
. This allows the radio to operate
OFF
for details.
command can be found on
HOPTIME
, ,
REPEAT 0 RETRY 0
and milli-
14 28
, .
HOPTIME 28
21