Campbell RF451, Руководство по эксплуатации продукта, Страница: 20 / 48

Table 7-1: Transmit power settings
RF transmit
power setting
RF power (dBm) RF power (mW)
7 26.8 480
6 25.2 330
5 23.6 230
4 21.5 140
3 19.0 80
2 15.4 35
1 10.0 10
0 7.0 5
7.1.9 Low Power Mode
This setting allows an endpoint to consume less power. This is achieved primarily by dimming the
transceiver LEDs. When set to 2 through 31, the transceiver will sleep between slots. For example,
at a setting of 2, the transceiver sleeps 1 out of 2 slots; at a setting of 3, the transceiver sleeps 2
out of 3 slots, and so on.
Table 7-2 (p. 14) shows the changes at different Low Power Mode settings. The actual current
draw depends on many factors. The following table gives only a qualitative indication of supply
current savings. A low number reduces latency and a high number reduces current consumption.
An optimum setting (balancing latency and power savings) is 2 or 3.
Table 7-2: Low power mode settings
Setting Description
0 Disabled
1 Transceiver remains awake, listening for the gateway radio transmission on every slot.
2 Transceiver sleeps every other slot
3 Transceiver sleeps 2 of 3 slots
4–31
Transceiver sleeps the number of slots corresponding to one less than the setting.
For example, with a setting of 31, the transceiver sleeps 30 of 31 slots.
RF451/RF452 Spread Spectrum Radio 14