D
M
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3
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T
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L
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1
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1
1
1
1
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9
8
7
6
5
4
3
E
E
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2
2
2
-
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6
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µ
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Figure 1
Theory of Operation
The major components of the DM1800-
433.92MN include an RFM TR3000 ASH
transceiver and a Microchip PIC16F688
microcontroller. The TR3000 operates on a
frequency of 433.92 MHz, at a nominal out-
put power of 1 mW.
ured as a logic input with a weak pull-up for
sensing a contact closure to a DM1800
ground pad. Digital Out is configured a logic
output. Analog In is configured as a 10-bit
analog-to-digital input. The DM1800 includes
two LEDs that indicate the module’s operat-
ing mode. The LEDs can be disabled for low
current operation.
The 16F688 provides a 9.6 kb/s serial inter-
face for communication with a host micro-
controller. A companion interface board is
also available with USB bridge circuitry to in-
terface the DM1800 to a host PC. Three of
the 16F688 I/O pins are configured for exter-
nal monitoring or control. Digital In is config-
The DM1800-434MN is compatible with
TM
RFM’s miniMESH network protocol, which
provides add-on “plug-and-play” multicast
mesh network routing to improve communi-
cation range and robustness.
2
RFM [ RF MONOLITHICS, INC ]
