Data Sheet

DM2200-916VM Theory of Operation
The major components of the DM2200-916VM include
the TR8100 ASH transceiver and the TI MSP430F148
microcontroller. The TR8100 operates on 916.5 MHz,
with a nominal output power of 10 mW. The MSP-
430F148 can operate referenced to either a 32.768 kHz
or 6 MHz crystal.
The MSP430F148 UART is used to provide a CMOS
serial interface on connector J2. The microcontroller’s
I/O pins are also available on connector J2 for external
monitoring or control. Note that GP0 is dedicated to
measuring the value of the received signal strength
indicator (RSSI) circuit and should always be set as an
analog input. The three LEDs on the transceiver module
display RF communication activity.
DM2200-916VM operation is based on RFM’s multi-
tasking VersaMESH
TM
network protocol, which supports
data and command transfers through both the serial in
-
terface and the RF channel. See the VersaMESH
TM
Pro
-
tocol User’s Guide for further details.
2
56789104321
GND VIN
11 12 13 14
VREN VDD TD0 TD1 TW S TCK RST CFG0CFG1CFG2CFG3 GND
J1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
J2
3 VD C
GRN
YEL
RED
TR 8100
ASH
Transceiver
RSSI
Low
Voltage
Reset
TXM O D
RXDATA
CFGDAT
CFGCLK
3 VD C
Voltage
Regulator
D M 2 2 0 0 B lo c k D ia g ra m
GND
GP7
GP6
GP5
GP4
GP3
GP2
GP1
GP0/RSSI
RTS
CTS
TXD
RXD
GND
M SP430F148
M icrocontroller
CFG
Figure 1