Parker Hannifin MSLINK0001 Serial Link Wireless DSSS Module User Manual Newx

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Document ID	1171690
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Date Submitted	2009-09-18 00:00:00
Date Available	2009-09-18 00:00:00
Creation Date	2009-09-18 09:51:39
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SerialLink Manual
Serial-Link Serial Packet Protocol (SPP) Draft version
1.00, for Internal MicroStrain use only
Working Draft: 9/18/2009
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):
Delivery Stop Flags:
App Data Type:
Node Address:
Application data Length:
Application data:
CheckSum:
0xAA
<1 byte>
<1 byte>
<2 bytes>
<1 byte>
<0 to 100 bytes>
<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.
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).
All devices should utilize the Standard Command App Data Type (and the corresponding
Command Packet Reply) for most I/O. Standard command app data has an App Data
type value of 0. The Application Data in a standard command packet contains a 2 byte
(16 bit, MSB:LSB) command followed by command data (if any). The standard
command generally reflects available serial (non-packet) commands for a device. In
other words, the application data of a standard command data type is simply a standard
serial command wrapped in a packet header and checksum. If a Command Packet
generates a reply, the reply should be in a Command Packet Reply App Data Type. Other
standard App Data Types are:
App Data Type
00
01
02
Name
Command packet
Cmd Packet reply
Error reply packet
Description
2 byte command + command data
2 byte echoed cmd + cmd result
2 bytes of error code
Node Address (2 bytes: Pkt[3] Pkt[4])
In outbound packets the Node Address is the address of the wireless link node. The
exception is the “broadcast” address which is defined as 0xFFFF (65535). Packets
addressed to 0xFFFF are received and processed by all nodes.
The node address allows the Serial-Link pipeline to become a “star” network at the base
station to link board device. Each node on the star has an individual 16 bit address with
valid address values being in the range of 1 to 65535. Practically speaking, a single star
cannot have 65535 nodes at one time. The practical limit depends primarily on the duty
cycle of the nodes, the limitations of the supporting host software, and the link quality or
LQI (in the case of a wireless link).
Application Data Length (1 byte: Pkt[5])
The maximum application data is restricted to 100 bytes. It may contain any binary data.
Application Data (0 - 100 bytes: Pkt[6] -> Pkt[AppDataLen + 5])
In the SerialLink system, there are some commands carried in the application data that
are common to all devices and so no prior knowledge of the type of device is needed, but
there are many command and data application datas that are specific to a particular
device. These commands are referenced in the documentation for the particular device.
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. In packet variants (see Packet
Variants) additional packet bytes between the application data and the checksum bytes
are NOT included in the checksum. The length of the array that is checksummed is
AppDataLength + 5. The total size of the packet including the checksum bytes is
AppDataLength + 8.
POWERING THE DEVICE AND CONNECTING TO THE UART
The device is powered by providing a DC voltage between 3.3 volts and 10 volts on pin 4
of the input connector. The ground return is provided on Pin 14 of the input connector.
The voltage input is internally regulated to provide a steady 3.0 Voltage source to the
board.
Pin 19 is the Transmit Line of the UART, this should be connected to the receive line of
the interface microprocessor. Pin 18 is the RX Line of the UART, this should be
connected to the transmit line of the interface microprocessor. The interface voltage
levels should be 3.0 V +/ 0.3 V.
ALLOWABLE ANTENNA & FCC STATEMENT
The device has been tested for FCC approval with the following antenna.
This antenna must be used with this module. Changes or modifications
made without the approval of Microstrain, Inc. could void the user’s
authority to operate this device.
\This antenna is attached to the RPSMA connector on the module.
ANT-2.4-CW-RCS
Manufacturer: Antenna Factor
FCC STATEMENT / IC STATEMENT
The modular transmitter must be labeled with its own FCC ID number listed below,
and, if the FCC ID is not visible when the module is installed inside another device,
then the outside of the device into which the module is installed must also display a
label referring to the enclosed module. Sample labels are provided below. . Changes
or modifications made without the approval of Microstrain, Inc. could void the user’s
authority to operate this device.
FCC ID: XJQMSLINK0001
IC: 8505A-MSLINK0001
LINK DATA TRANSCEIVER
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
(3) interference that may cause undesired operation.
CONTAINS FCC ID: XJQMSLINK0001
IC: 8505A-MSLINK0001
LINK DATA TRANSCEIVER
RF Exposure
FCC rules limit exposure to radio frequency radiation. To comply with these rules, this
device must be installed and operated such that the installers and operators of this device
will not be closer than 20cm to the antenna under normal conditions.


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