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User's Manual

ManualsBrandsMedtronic MiniMed ManualsGlucose MonitorsThe Guardian Link transmitter is a component of the continuous glucose monitoring system for the MiniMed 600 series insulin pumps. The transmitter collects data from the glucose sensor and then wirelessly sends the data to the insulin pump.
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Battery life Transmitter: Six days of continuous glucose monitoring immediately
following a full charge
Charger: Completes 40 typical charging operations using a new AAA
alkaline battery
Transmitter
 frequency
2.4 GHz, 2M65G1D modulation, less than 1mW ERP
Transmitter expected
life
The transmitter expected life is 1 year depending on patient usage.
Guardian Link wireless communication
Quality of service
The Guardian Link transmitter and the MiniMed 640G insulin pump are associated as
part of an 802.15.4 network for which the pump functions as the coordinator and the
transmitter as an end node. In an adverse RF environment the pump will assess channel
changing needs based on "noise" levels detected during an energy scan. The pump will
perform the energy scan if after 10 minutes no CGM transmitter signal has been
received. If the channel change occurs the pump will send beacons on the new channel.
The Guardian Link transmitter will initiate a channel search when beacon detection fails
on the associated channel. The search will be conducted across all five channels. When
the beacon is located the transmitter will rejoin on the identified channel. Upon re-
association any missed packets (up to 10 hours) will be transmitted from the transmitter
to the pump.
In normal operation the transmitter will transmit a packet every 5 minutes and retransmit
the packet if the data is corrupted or missed.
Radio frequency (RF) communications specifications
•  Pump to transmitter frequency: 2.4 GHz; proprietary Medtronic protocol; range up to
6 feet (1.8 meters).
•  Utilizes the IEEE 802.15.4 protocol with the proprietary data format.
Data security
The MiniMed 640G insulin pump is designed to only accept radio frequency (RF)
communications from recognized and linked devices (you must program your pump to
accept information from a specific device).
The MiniMed 640G insulin pump and system components (meters and transmitters)
ensure data security via proprietary means and ensures data integrity using error
checking processes, such as cyclic redundancy checks.
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