The FreeLynx is a wireless headstage that records from up to 256 individual electrodes. The physiological signals are digitized at the headstage and either transmitted wirelessly or recorded to a microSD memory card in the FreeLynx.

This document describes the specifications and features of the FreeLynx. It also explains how to set up, test and use your FreeLynx. There is a glossary at the end of the document.

 

Please see attached PDF.

Version 1.5, 2021-02-18

 

Table of Contents

1 Document Overview ................................................................................................... 7

2 FreeLynx Product Overview ....................................................................................... 7

3 FreeLynx Components and Accessories ..................................................................... 8

3.1 FreeLynx Base...................................................................................................... 8

3.2 Analog Front End (AFE) ...................................................................................... 8

3.3 256 Channel LVDS Bridge Board ....................................................................... 8

3.4 FreeLynx EIB-72-QC-Large ................................................................................ 9

3.5 FreeLynx EIB-72-QC-Small ................................................................................ 9

3.6 FreeLynx Power Tether ........................................................................................ 9

3.7 FreeLynx Battery Charger .................................................................................. 10

3.8 FreeLynx Batteries ............................................................................................. 10

3.9 Power Stick ........................................................................................................ 10

3.10 IR Transmitter................................................................................................. 11

3.11 IR Receiver ..................................................................................................... 11

3.12 SM-72-QC ...................................................................................................... 11

3.13 FreeLynx Training Weight ............................................................................. 12

3.14 Video Tracking LEDs ..................................................................................... 12

3.15 Ultrasonic Microphone ................................................................................... 12

4 Setup ......................................................................................................................... 13

4.1 Electrostatic Sensitive Equipment ...................................................................... 13

4.2 Two Ways of using a FreeLynx ......................................................................... 13

4.3 Connect-to-Cheetah ............................................................................................ 13

4.4 Connect-to-SX .................................................................................................... 18

4.5 Test the FreeLynx with a Test Input Signal ....................................................... 22

4.6 Try a FreeLynx Command by Controlling Tracking LEDs ............................... 26

5 Recording Data to microSD Card ............................................................................. 28

5.1 Commands for microSD Recording ................................................................... 28

5.2 Recorded Data Files ........................................................................................... 28

5.3 Raw Data File Converter .................................................................................... 29

5.4 Important Notes to Prevent Data Corruption ..................................................... 29

5.5 microSD Card Requirements ............................................................................. 30

5.6 Switching between microSD and Wi-Fi Recording ........................................... 30

6 Hardware Overview .................................................................................................. 31

6.1 Amplifier and Analog to Digital Converter ....................................................... 31

6.2 Referencing ........................................................................................................ 32

6.3 Status LED ......................................................................................................... 33

6.4 Wireless Communication ................................................................................... 35

6.5 AFE Interface Connector ................................................................................... 35

6.6 Digital I/O Connector ......................................................................................... 36

6.7 Tracking LEDs ................................................................................................... 37

6.8 Connecting a Battery to the FreeLynx ............................................................... 37

6.9 Turning the FreeLynx On or Off with the Power Stick ..................................... 38

6.10 Turning the FreeLynx On or Off with the IR Remote .................................... 39

6.11 Disconnecting a Battery from the FreeLynx .................................................. 41

6.11 Disconnecting a Battery from the FreeLynx .................................................. 41

6.12 Charging the Battery ....................................................................................... 41

6.13 FreeLynx Power Tether .................................................................................. 43

6.14 MicroSD Card................................................................................................. 44

7 Pairing a FreeLynx with a Digital Lynx SX ............................................................. 45

7.1 Manual Pairing ................................................................................................... 45

7.2 Automatic Pairing .............................................................................................. 47

8 Wireless Access Point Setup ..................................................................................... 49

8.1 Selecting a Good Wi-Fi Channel ....................................................................... 50

9 FreeLynx Commands ................................................................................................ 52

9.1 SetDigitalIOPortDirection .................................................................................. 53

9.2 SetDigitalIOBit................................................................................................... 54

9.3 GetDigitalIOPortValue....................................................................................... 56

9.4 SetDigitalIOPortValue ....................................................................................... 57

9.5 SetTrackingLED*............................................................................................... 58

9.6 GetRegister ......................................................................................................... 59

9.7 SetRegister ......................................................................................................... 60

9.8 PowerOffSystem ................................................................................................ 61

9.9 GetSystemSerialNumber .................................................................................... 62

9.10 GetProductName* .......................................................................................... 63

9.11 GetProductRevision* ...................................................................................... 64

9.12 GetFirmwareVersion* .................................................................................... 65

9.13 GetChannelCapacity* ..................................................................................... 66

9.14 SetChannelCapacity........................................................................................ 67

9.15 GetMACAddress* .......................................................................................... 68

9.16 GetIPAddress* ................................................................................................ 69

9.17 SetIPAddress .................................................................................................. 70

9.18 GetBatteryVoltage .......................................................................................... 71

9.19 GetAverageCurrent ......................................................................................... 72

9.20 GetMaxCurrent ............................................................................................... 73

9.21 GetStateOfCharge ........................................................................................... 74

9.22 GetCoreTemp* ............................................................................................... 75

9.23 GetShutdownVoltage...................................................................................... 76

9.24 GetTransmittedChannels ................................................................................ 77

9.25 SetTransmittedChannels ................................................................................. 78

9.26 GetBatteryType* ............................................................................................ 80

9.27 SetBatteryType* ............................................................................................. 81

9.28 GetSSID* ........................................................................................................ 82

9.29 SetSSID .......................................................................................................... 83

9.30 GetShutdownTemp ......................................................................................... 84

9.31 Convert ........................................................................................................... 85

9.32 Calibrate.......................................................................................................... 86

9.33 ClearCalibration.............................................................................................. 87

9.34 SetOffsetRemovalEnabled .............................................................................. 88

9.35 SetOffsetRemovalMultiplier .......................................................................... 89

9.36 SetHighCutFilterFrequency ............................................................................ 91 

9.37 SetLowCutFilterFrequency ............................................................................ 93

9.38 SetImpedanceMeasureEnabled ....................................................................... 95