User Manual

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SerialLink Manual

Serial-Link Serial Packet Protocol (SPP) Draft version

1.20, for Internal MicroStrain use only

Working Draft: 8/7/2012

Overview

The Serial-Link Serial Packet Protocol (SPP) defines a standard for delivery of data and

commands over the Serial-Link UART communications pipeline. To communicate,

each device is capable of reading, responding to, and forwarding an SPP Packet. Any

device may originate a message and receive a reply from any other device. A single

packet may be delivered to multiple devices. If a device does not exist on the pipeline,

or is incapable of responding to a particular packet, it replies with an error, but will

propagate the packet to the next device, if it exists, so that the next device may respond to

the packet. The protocol to send a packet is shown below.

Hardware UART specifications

115,200 bps, no parity, 8 data bits, 1 stop bit

Packet Description

The basic structure of the SPP Packet looks like this:

Start Of Packet (SOP): 0xAA

Delivery Stop Flags: <1 byte>

App Data Type: <1 byte>

Node Address: <2 bytes>

Application data Length: <1 byte>

Application data: <0 to 100 bytes>

CheckSum: <2 bytes>

The size of the packet is always AppDataLength + 8 (except for a variant – see Packet

Variants) and the checksum is always the last 2 bytes (even for variants).

Start Of Packet (SOP) (1 byte: Pkt[0]):

The start of packet is a single byte of the value 0xAA (or binary 10101010)

Delivery Flags (1 byte: Pkt[1])

Delivery flag instructs the receiving device how to act upon reception of the packet.

This is currently fixed at a hex value 01H which instructs the receiving device to forward

the received packet over its UART.

Summary of content (7 pages)

PAGE 1
SerialLink Manual Serial-Link Serial Packet Protocol (SPP) Draft version 1.20, for Internal MicroStrain use only Working Draft: 8/7/2012 Overview The Serial-Link Serial Packet Protocol (SPP) defines a standard for delivery of data and commands over the Serial-Link UART communications pipeline. To communicate, each device is capable of reading, responding to, and forwarding an SPP Packet. Any device may originate a message and receive a reply from any other device.
PAGE 2
App Data Type (previously: Address Mode) (1 byte: Pkt[2]) The App Data Type defines the type of the application data. It allows the target MCU to determine what to do with the payload. If a target MCU does not recognize the App Data Type, it simply ignores it (or generates an error reply). Even if a target does not recognize the App Data Type, it should still pass the packet through to the next target (if any).
PAGE 3
As a general convention, multi-byte values in the application data are recommended to be represented as big-endian values (MSB:LSB). Several standard app data types Checksum (2 bytes: Pkt[AppDataLen + 6], Pkt[AppDataLen + 7]) The checksum is a 16 bit big-endian integer (MSB:LSB) that is the byte-wise sum of all the bytes in the packet starting AFTER the SOP and ending with the last byte of the application data. The SOP is not part of the checksum.
PAGE 4
Electrical Specifications Frequency 2400-2500 MHz Gain 2.2 dBi Impedance 50 Ohm VSWR < 2.
PAGE 5
HOST PRODUCT LABELING: The host product must be labeled with the following: “Contains FCC ID: XJQMSLINK0003” “Contains IC: 8505A-MSLINK0003” HOST PRODUCT MANUAL STATEMENTS: The host product user’s manual must contain the following statements when the Link Data Transceiver is installed. FCC – “Changes or modifications not expressly approved by Microstrain, Inc. could void the user’s authority to operate the device.” “This device complies with Part 15 of the FCC Rules.
PAGE 6
INDUSTRY CANADA This device complies with Industry Canada licence-exempt RSS standard(s). Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device. French: Cet appareil est conforme avec Industrie Canada exempts de licence standard RSS (s).
PAGE 7
Caution: Exposure to Radio Frequency Radiation. To comply with RSS 102 RF exposure compliance requirements, for mobile configurations, a separation distance of at least 20 cm must be maintained between the antenna of this device and all persons. This device must not be co-located or operating in conjunction with any other antenna or transmitter.