User Manual

678.551.2871 Trellis, Inc. http://mytrellis.com
Mercury Module Interface Manual
FOR INTERNAL USE ONLY – TRELLIS PROPRIETARY
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two
conditions: (1) this device may not cause harmful interference, and (2) this device must accept
any interference received, including interference that may cause undesired operation.
The Mercury Module is a limited modular transmitter, for use by Trellis systems only, including
the Wireless Sensor Station and Central Base Station. It may be incorporated into other
platforms that meet the interface requirements in this document. This radio uses the 902-928
MHz ISM band and utilizes LoRa modulation at 128 kHz bandwidth, 4/5 coding rate, and a
spreading factor of 8. The radio utilizes a reverse polarity SMA antenna connector. The radio
uses a pseudo-random frequency hopping technique where each frequency is used equally on
average by each transmitter. The system receivers have input bandwidths that match the
hopping channel bandwidths of their corresponding transmitters and shift frequencies in
synchronization with the transmitted signals. Data packets are limited to 256 bytes, including a
4 byte header, 251 byte payload, and 1 byte checksum.
Pin #
Signal
Usage
Voltage Levels
1
VCC
Power to the module
2.4V – 3.7 V
2
DIO5
General purpose IO
0V – VCC
3
RESET
Reset for radio module. Pull to VCC for active.
0V – VCC
4
N/C
-
-
5
SS
SPI Source Select
0V – VCC
6
CLK
SPI Clock
0V – VCC
7
MISO
SPI Master In, Slave Out
0V – VCC
8
N/C
-
-
9
MOSI
SPI Master Out, Slave In
0V – VCC
10
GND
Ground
-
11
N/C
-
-
12
N/C
-
-
13
N/C
-
-
14
DIO_2
General purpose IO
0V – VCC
15
N/C
-
-
16
INT
Interrupt output
0V – VCC
17
DIO_4
General purpose IO
0V – VCC
18
N/C
-
-
19
DIO_3
General purpose IO
0V – VCC
20
GND
Ground
-