Linking 1158C DI with 858C

I just got a new 1158c with down imaging and am planning to mount it on the bow using the US2 Transducer in my Minnkota. I also have a 858c without down imaging that I am planning to use at the console. I am planning to use the ethernet connection between the two and am wondering how I can get the down imaging to work on the 1158. I dont think the US2 transducer has down imaging. Also, would it work to connect the 1158 down imaging transducer to the 858? Will the ethernet connection share the down imaging information even though the 858c does not have down imaging? Do I also need to use a switch?

I believe both units need to have DI capability to display DI data. Your US2 transducer does not support the DI/SI frequencies.

I mounted the down imaging transducer that came with my 858C Di Combo on the trolling motor and it works fine.

From HumminBird

An explanation about the transferring of Sonar information
A unit can only receive Sonar information over the Ethernet that it is capable of using without Ethernet. By this I mean that for a unit to receive Side Imaging Sonar information over the Ethernet it must be a side imaging unit.
2D sonar units will only receive 2D sonar over the Ethernet
Examples: 778c HD, 788ci HD, 858c,958c,1158c
Side Imaging Units can receive 2D, DownImaging from Side Imaging and Side Imaging Sonar over Ethernet
Examples: 798ci SI, 898c SI, 998c SI, 1197c SI, 1198c SI
DownImaging units can only receive 2D Sonar and DownImaging Sonar
Example: 788ci HD DI

Special Note

(Down Imaging from Side Imaging) and (DownImaging) are two different technologies and aren’t compatible over Ethernet.

Explanation
The DownImaging that comes from a Side Imaging Unit will not transfer via Ethernet to a DI unit. For example if I hook up a 1198 and 788ci HD DI unit the only information they can share is the 200kHz Downlooking sonar. No DownImaging information will be shared.
If I hook up a 1198 to a 798 they will share 200kHz downlooking, 83kHz downlooking, DownImaging from Side Imaging and Side Imaging Sonar.

Thanks for the comments. Does anyone know if I could attach the 1158c di transducer to the 858 and then access the down imaging information on the 1158c di through the ethernet cable? or is there some way to hook up the down imaging transducer on the back and change between the us2 and the down imaging transducer by using a switch?