User's Manual

MDS 05-2708A01, Rev. D MDS TransNET I&O Guide 61
Reading RSSI and Other Parameters with LPM Enabled
It may be desired to perform tests and review operational settings of a Remote
radio which has been programmed to operate in the low-power mode. Follow
the abbreviated procedure below to interact with the radio through a local
computer.
• Disconnect the Remote’s antenna to force it to lose sync with the
Master
• Power-down the radio
• Connect a computer running TransNET configuration software to the
Remote’s DIAG(nostic) port.
• Power-up the radio
• Reconnect the antenna
• Measure the RSSI or review and change any parameters you desire
Power Consumption Influence by HOPTIME and SAF Settings
Table 24 presents representative current consumption and data delay values
for various settings of TransNET radios setup for Low Power Mode, LPM
(See “LPM [1, 0]” on Page 36). It assumes the primary power voltage is
13.8 Vdc and the polling rate is minimized to yield best-case power consump-
tion (current) values.
The more each RTU is polled and asked to transmit, the more current will be
consumed. Therefore, these values are the lowest that can be expected. Power
consumption (current) is inversely related to data delay as shown in the table.
When a radio is sleeping (LPM) mode, it is also waiting longer to deliver the
payload data.
Note, the Store-and-Forward setting has a significant effect on power
consumption, as it effectively doubles the HOPTIME to support LPM
services. For the most power-efficient operation, turn on SAF even if you are
not using repeaters.
Table 24. Power Consumption versus Hoptime and SAF Settings
HOPTIME SAF Current (ma) Data Delay
7 OFF 16 350 ms
7ON10780 ms
28 OFF 7 1620 ms
28 ON 4 3360 ms