19
Man ual W M-IIRO -8
Chapter 5: Specification
General
•
Con ne ctivity:
A serial cable connec ts the host com puter’s CO M po rt
with ACC ES’s W M-D P-232 m odem , which in turn
communicates with the WM-IIRO-8 via a 900 MHz
wireless connection.
•
Intelligen ce:
Type 8051 microcontroller family provides capability of
local control.
•
Protection:
W atch dog Tim er circ uit
•
Mem ory:
Up to 32k RAM & 32k EEPROM.
•
Size of NEMA4 box:
4.53" long by 3.54" wide by 2.17" high
•
W eight:
19.0 oz
Power Requirements
•
Voltage Range:
7.5 to 15 vo lts
•
Current Range:
130 mA - idle mode
30 mA - increase per relay activation
100 mA - increase during constant transmission
470 m A - m axim um
Idle mode m ay be reduced to 70 mA with cyclic sleep mode
900 MHz Radio
•
Frequency Range:
902 to 928 MHz, Unlicensed ISM Band
•
Type:
Frequency Hopping Spread Spectrum T ransceiver
•
Th roug hpu t:
9600 baud
•
Trans m it Power:
100m W
•
Rec eiver Se ns itivity:
-110dBm
•
Outdoor Range:
7 m iles ( the oretic al with line o f sigh t )
•
Interference Rejection:
70dB at pager and cellular phone frequencies
900 MHz Antenna
•
Frequency Range:
902 to 928 M Hz
•
Impedance:
50
S
nominal
•
Gain:
2.1 dBi
•
Length:
7"
•
Polarization:
Vertical
•
W ave:
Half W ave
•
Conn ector:
SMA reverse polarity plug (RPSMA)
