RIB to Radio cable help

[TexMN]

I have looked at the Polaris/Motorola RIB pin out guide and the cable diagram for a gp300. My question is the cable diagram shows pins 4 and 11 connected, on the Polaris unit pin 11 is 15, but 4 is not listed on the pin conversion, is 4 the same on both the Polaris and Motorola RIBs?

[Monty]

HI:

Pin 4 to 11 is used on " Motorola " made
Cables and is a Bias return voltage used
for the Factory motorla Rib Boxes.

When using clones, many times depending
on the vendor of the clone, they just
" leave " it out, and go direct

When addressing Motorola Products, it is
Highly Recommended to stick with the Factory
lay out.....It will save you alot of grief
in preventing a code plug corruption.

I restore 100's of them each year, should
you run into a problem, I can fix most of them ( Except for the CDM/Pro ) Series

Monty

[Will]

This is TRUE. The Motorola RIB has the bias enabled by a jumper in the radio to RIB cable on the radios that use a single ended programming scheme. For dual programming the jumper is not used, and one of the Buss leads from the radio provides the correct bias for the RIB. Without the bias or Buss connection the RIB does not mirror back to the computer serial buss and the RSS and the RSS goes ERROR.
Non Motorola RIBs do not use the same circuits and bias. And some will not work with some radios, and it goes on.

[TexMN]

Thanks guys for the replies. I found after discussing it with the tech dept. at Polaris that my problem was. I was using an Athlon 1.2ghz computer to try to communicate with the radio (it's too fast for the radio, go figure) I hooked everything up on my old 486 laptop and it worked.