they weren't designed as full interfaces with all the signals that a DMK or their own RB URI brought out, hence the price (and thinking board form factor) and feature set. Looks like they were designed to interface between a radio by direct plug in on the header on the back of the CDM and a computer running app-rpt and not much else.

I'm thinking anything extraneous to that mission was left out, since there are multiple options (DMK,RB, DIY) that already accomplish the same thing.

Kyle K0KN in Olathe KS wrote a set of scripts that do fan control based on the event subsystem setting a flag after x seconds on transmit, setting a GPIO pin, running them for y seconds after the repeater goes idle. DMK published a simple schematic for a relay circuit that buffers the GPIO; 1 resistor, 1 diode, 1 transistor, and a pcb relay. Been using his scripts and that circuit since '11, with zero issues to control the fans on my machines here.
--

Bryan

Sent from my iPhone 6S...No electrons were harmed in the sending of this message.

On Jun 21, 2016, at 07:24, Stephen - K1LNX <k1lnx@k1lnx.net> wrote:

Hi guys,

I'm running a pair of UHF CDM1550's in full duplex with one of the new Repeater Builder Rim "lite" RM interfaces:

http://www.repeater-builder.com/products/usb-rim-lite.html

It does not look like I can tap the GPIO's very easily on these boards, nor can I tell if GPIO 5-8 is available for general use looking at the schematic:

http://www.repeater-builder.com/products/pdfs/RB_RIM_Max.pdf

What I'd like to do is drive a relay board to switch a fan on if the receiver is active or there is traffic coming in to the node, being connected to another station or hub for example. I read over the GPIO and event management subsystem documentation, and it looks like that's what I need, but I don't have a parallel port nor can I tap the GPIO's on my interface easily (or even know if they can be used as per the above).

Looking for ideas here if anyone else has encountered this, would prefer the logic/relay board approach vs. say a temperature controlled switch on the heatsink or something.

Stephen

K1LNX

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