User Manual

COMMUNICATION CERTIFICATION LABORATORY TEST REPORT: 73-6560
FCC ID: NQE1005
NQE1005 TIM TRANSMITTER
Functional Description
General Description
The TIM Transmitter remains in "sleep" mode until an input event occurs. The TIM Transmitter
wakes up to monitor and accumulates switch closures. Events represent units of power or other
similar items measured. Events are monitored by closures between pins 1 and 6 of connector JP2.
Events are accumulated and compared to a preset number
(1 to 10,000 set at installation).When this count is reached it will trigger, transmitting a data
packet containing the total accumulated count. This data is transmitted to a receiver station using
FSK (Frequency Shift Keying) modulation, on 1 of 25 different frequency channels ranging from
902 to 928 MHz. The complete packet transmits within 0.043 seconds. After the data has
transmitted, the transmitter returns to “sleep” mode and collects another set of data. This process
is then repeated when the next preset count is reached and transmitted on the next frequency
from the hop table. As an example, let’s say the meter count is at 1000 units of gas used and the
preprogrammed event count is set at 10. The TIM wakes up 10 times to advance the accumulator
but will only advance the transmitter channel on the tenth event. At this point the accumulated
count of 1010 would be sent. All 25 transmit frequency channels are used before any given
frequency is repeated. The worst case or shortest delay that the firmware allows is 0.043 seconds
between channels. Accounting for switch debounce of 1ms, a wakeup time of 1ms, 4ms to setup
the PLL, and 0.037 seconds to transmit. It takes 1.075 seconds to visit all 25 channels
(0.043x25=1.075 seconds). Any one channel could be visited 9.3 times in 10 seconds (10\1.075 =
9.30). Total transmit time for any 10 second period is 9.3x .037 for 0.344 seconds, 0.4 seconds is