User's Manual
2029 Becker Dr
Lawrence, KS 66047
2. Data Protocol For US-D1
2.1 UART Data Protocol Specifications
● Baud Rate: 115200 b/s
● Data bit: 8
● Parity bit: N
● Stop bit: 1
● Voltage Level: 3.3V
A single data packet consists of six(6) bytes. Table 2 defines the packet structure.
Table 2: UART Data Packet Definition
Notes:
● '*' refers to a variable bit containing dynamic data.
● Altitude: The altitude bytes can be combined (total 16 bits) to represent the altitude information in
centimeters. The structure would be: 0x[MSB][LSB], where MSB and LSB are each two hexadecimal
numbers (8 bits).
● Checksum: The Checksum Byte could be used in the following:
○ checksum = (Version_ID + Altitude_H + Altitude_L + SNR) & 0xFF
○ If checksum = 1, check passed
○ if checksum = 0, check failed
Proprietary information
Page 5
From
US-D1 Altimeter
To
Receiver
Byte
Data
Note
1
0xFE
Packet Head
2
0x02
Version ID
3
0x**
Altitude (Least Significant 8 Bits)
4
0x**
Altitude (Most Significant 8 Bits)
5
0x**
SNR
6
0x**
Checksum (see formula below)