I'm afraid not ... The Comm port on the smaller internal antenna units are only used for HB technician connection during service ...
HELIX 5 DI
SPECS | SUPPORT
Display Size - Diagonal:5"
Display Pixel Matrix:800H X 480V
Display Type:Color TFT
Display Colors Grayscale:256 Colors
Sonar Standard:Down Imaging/DualBeam PLUS
Standard Sonar Coverage:16°, 28°, 45° & 75° @ -10db
Standard Sonar Frequency:455/800/200/455 kHz
Sonar Optional:None
Target Separation:2.5"
Power Output RMS:500 Watts
Power Output Peak to Peak:4000 Watts
Depth Capability:350 ft (DI) & 600 ft (2D)
Temperature:Built In Transducer
Speed:Optional
Backlight:LED
Unit Size - Gimbal Mount:7.55"W x 4.64"H x 3.3"D
Mount A Type:Gimbal Mount
Unit Size - Indash Mount:7.55"W x 4.28"D x 1.13"D
Mount B Unit Size2:Optional In-Dash
Mounting Options:Gimbal or Optional In-Dash
Transducer Standard:XNT 9 DI T
Transducer Mounting:Transom
Power Input:10-20 VDC
Power Draw:615 mA
GPS Receiver:Not Supported
GPS Tracking:Not Supported
GPS Chartplotting:Not Supported
Humminbird Mapping:Not Supported
Navionics Gold/HotMaps:Not Supported
Navionics Platinum+:Not Supported
Platinum Capable:Not Supported
C-Map 4D:Not Supported
360 Imaging:Not Supported
i-Pilot Link:Not Supported
HD Radar:Not Supported
NMEA 2000:Not Supported
5 Port Expansion Module:Not Supported
WeatherSense:Not Supported
Precision GPS:Not Supported
Heading Sensor GPS:Not Supported
PC Connect:Optional
External GPS Receiver:Not Supported
AS Interlink:Not Supported
AIS Compatability:Not Supported
SwitchFire Sonar:Included
Screen Snap Shot:Not Supported
Sonar Recording:Not Supported
Humminbird PC:Included
Upgradable Internal Software:Optional
Split Screen Zoom:Included
Split Screen Bottom Lock:Included
3D Chart View:Not Supported
Large Digits View:Included
Wide/Narrow Cone Split Screen:Included
Custom View Selections:Included
Custom Digital Readout:Included
View Preset Keys:Not Supported
Temperature Graph:Not Supported
Temperature Alarm:Included
Freeze Frame:Included
Instant Image Update:Included
Mark Structure on Sonar:Not Supported
Selective Fish ID+:Included
Real Time Sonar:Included
Triplog:Optional
X-Press Menu System:Included
Card Reader Available:No
Domestic CHO:no
Intl Portable:no
Hardware:MHX XNT
Transducer 2:XNT 9 DI T
Bronze Thru Hull:N/A
Plastic Thru Hull:XPTH 9 DI T
Puck:XIH 9 DI T
Trolling Motor:XTM 9 DI 25 T
Angled Puck:N/A
Portable 2:N/A
Bronze 3-n-1:N/A
Rickie