Question - Building GM300 Prg Cable

[dapaq2]

Guys,

I am looking to build a programming cable for the Motorola GM300 and I have a question about the bias mentions on this page.
http://www.batlabs.com/images/maxpin.gif

It shows 1.7 BIAS, (Im assuming thats some sort of resistor?) What exactly is that and what do I need to get?

Thanks

Doug

[Bill_G]

No. It's just a jumper from pin 4 to 11.

[dapaq2]

Oh ok, Thanks Bill. Kind of deceiving on the mention of "bias". I thought for sure it was some sort of resistor or capacitor required. Being that its just a jumper makes it much simpler. Again thanks for the reply and info.

Doug

[jackhackett]

You can see where the bias comes from in the RIB schematic, a simple voltage divider on the +5volts. This gets fed back into the RIB and biases the opamp in the RX portion of the serial interface.

[dapaq2]

It is pins 4 and 7 on the RJ45 connector, correct? I cannot quite tell by the diagram.

Doug

[Al]

Correct, 4 & 7.