[TG] [TG11] RS 62157 Cable for A70D - source?

[Tom - Raymarine - Moderator]

Hello Dave,

Quote:Q1: Is it ok to use two converters or should I try to run everything from one?

I would always avoid multiple convertors and keep to an absolute minimum the number of separate networks. I would use a single Seatalk network.

Quote:Q2: Is it ok to use “T” splices in a Seatalk bus?

As long as the splices are good (so not the usual not-properly-fused, twist-and-tape horrors that cause fire risks in almost every old Seatalk network I've been unfortunate enough to see), T-junctions are fine. Seatalk is very tolerant of the network layout, a luxury that becomes impractical as networks get faster (NMEA2000.)

Quote:Q3: Is it ok to have 5 devices taking power and 6 devices taking data from the single converter?

There are only fairly narrow PCB tracks inside the ST1-STNG convertor so you shouldn't try to power a big network through it, but the devices you list should be ok.

Quote:Q5: What is the best practice for powering a large number of Seatalk devices when ST1/STNG Converter(s) are in the system?

I don't think we have an established best-practice recommendation for this, but I would have a separate (fused) power on each side (only 1 on each side) of the convertor, with the red wire disconnected on one side or the other of the convertor and a label at the disconnection to make clear to the next person who works on the system why it's disconnected and not to reconnect. Labels are imperative!

Regards,
Tom