Operation with pni binary protocol, Datagram structure, Table 7-1: configuration – PNI CompassPoint Prime User Manual
Page 36: Figure 7-1: datagram structure, On 7, 7operation with pni binary protocol, 1 datagram structure
PNI Sensor Corporation
DOC# 1014177 r08
Prime User Manual
– July 2011
Page 30
7
Operation with PNI Binary Protocol
The Prime utilizes a binary protocol that is transmitted over an RS232 interface. The
configuration parameters should be set as follows:
Table 7-1: Configuration
Parameter
Value
Number of Data Bits
8
Start Bits
1
Stop Bits
1
Parity
none
7.1
Datagram Structure
The data structure is shown below:
ByteCount
(UInt16)
Packet Frame
(1 - 4092 UInt8)
CRC-16
(UInt16)
Payload
(1 - 4091 UInt8)
Frame
ID
(UInt8)
Figure 7-1: Datagram Structure
The ByteCount is the total number of bytes in the packet including the CRC-16 (checksum).
CRC-16 is calculated starting from the ByteCount to the last byte of the Packet Frame (see
included C function at end of document). The ByteCount and CRC-16 are always
transmitted in Big Endian.