User's Manual

COMPANY CONFIDENTIAL
RF-TWACS Based AMR System DCSI CUSTOMER PRODUCT SPECIFICATION
May 30, 2003 Application Notes – Rev. 1 14
Figure 9 – State Diagram for the RMTR
4.2.2.4 RMTR Maintenance
The RMTR requires a battery change-out approximately once every 15 years. Expended
batteries should be disposed of in accordance with local regulations. Battery voltage
levels may be remotely checked by the CCE.
4.2.3 Electric Meter Transceiver (EMTR)
4.2.3.1 EMTR Specifications
Power Source: EMT-3C-MP power supply
Communication Range: 1200 ft. open field @ max. power amplifier gain
Frequency of Operation: 902 to 928 MHz
Number of Channels: 5 link acquisition + 45 link maintenance, bi-directional.
Frequency Selection: Pseudo-random Frequency Hopping Spread
Spectrum. (The link acquisition channels are not
part of the hopping sequence).
Signal Strength Indicator: Integral Received Signal Strength Indicator (RSSI).
Occupied Channel Selection Method: Walkthrough channel list in ascending order. RTS
packets from a suitable RMTR, or HHTR are
accepted. Any other traffic causes the EMTR to
immediately abandon the channel and move on.
Gain Control: 3 discrete auto-adjustable levels of transmitter
power.
TX Power Amplifier Gain: The EMTR reciprocates with the same Tx Gain that
the Requesting device uses.
Data Flow: Asynchronous, half duplex.
Data Format: 8N1
Modulation: FSK
Sleep
“Dotting”
Valid
Session
Timeout occurs, or
ACK received from a disallowed EMTR/, or
ACK is addressed to a different RMTR/
Timeout or
“COMPLETION”/
Awaken
with
message/
“ACK” received from
allowed EMTR / send
acknowledgement confirming
link is established.
Command
received from
EMTR /
transmit more
data
NAK received/
retry packet