this is what it says on page 23 of the manual, so yes you could.but you need cannonlink to do it.
Networking your Digi-Trolls
Up to six Digi-Troll series downriggers can be networked together with the CannonLink accessory. To network your
downriggers you will need the Relay Cable Accessory (019634) between each downrigger you would like to link.
The CannonLink cable will install to the Data In connector on the fi rst downrigger. Connect all other downriggers
by connecting the Relay Cable Accessory from the Data Out to the Data In of the next downrigger. A terminator is
needed on the last downrigger Data Out in order for the downriggers to properly communicate. This terminator is
included in the CannonLink accessory.
the complete digitrol 5 manual can be downloaded here
http://www.cannondownriggers.com/product_manuals/