Installation Manual

IRIS OEM Edition Hardware Reference Manual
Page 24 Doc. # 7430-0549-01 Rev. B
6 Radios
6.1 M2110
The radio used by the M2110 is an IEEE 802.15.4 compliant RF transceiver designed for low-
power and low-voltage wireless applications. It uses Atmel’s AT86RF230 radio that employs O-
QPSK (“Offset Quadrature Phase Shift Keying”) with half sine pulse shaping. The 802.15.4
radio includes a DSSS (digital direct sequence spread spectrum) baseband modem providing a
spreading gain of 9 dB and an effective data rate of 250 kbps. The radio is a highly integrated
solution for wireless communication in the 2.4 GHz unlicensed ISM band. It complies with
worldwide regulations covered by ETSI EN 300 328 and EN 300 440 class 2 (Europe), FCC
CFR47 Part 15 (US) and ARIB STD-T66 (Japan).
6.1.1 Radio RF Channel Selection
The M2110’s Atmel radio can be tuned within the IEEE 802.15.4 channels that are numbered
from 11 (2.405 GHz) to 26 (2.480 GHz) each separated by 5 MHz.
6.1.2 Radio Transmission Power
RF transmission power is programmable from 3 dBm to –17.2 dBm. Lower transmission power
can be advantageous by reducing interference and dropping radio power consumption.
Table 6-1. Atmel® AT86RF230 Output Power Settings
RF Power
(dBm)
Power Register
(code)
3.0 0
2.6 1
2.1 2
1.6 3
1.1 4
0.5 5
-0.2 6
-1.2 7
-2.2 8
-3.2 9
-4.2 10
-5.2 11
-7.2 12
-9.2 13
-12.2 14
-17.2 15
The RF received signal strength indication (RSSI) is read directly from the AT86RF230 Radio
and sent with every radio packet received.