Cat 9 pin diag port pin layout

Yes, the problem I have is it I can't really tell which is the fake and which is the real deal

Jrod25 said: Yes, the problem I have is it I can't really tell which is the fake and which is the real deal Click to expand... It's relatively easy. when searching:-

1. Only search for used items.
2. Discard anything that says it is supplied/ships from India, even if the ad says it is "used". I can guarantee it won't be.
3. Discard anything that does not show a carrying case in the photos of the item. An OEM Comm Adapter was ALWAYS supplied in a carrying case when it was new.
4. Look closely at the carrying case. Consider the case style, that it carries the Cat Part Number label, and look for it to be well worn. See this LINK as an example. I found that in less than 2 minutes. From the photos I would say it is a used genuine OEM Comm Adapter. It's a Series II Comm Adpater so not the latest. It may be necessary to look for a couple of weeks waiting for one to turn up.

Ok thanks, I think I'm going to buy one of these, so for my 2013 272D XHP, it doesn't matter if it's an adapter II? I thought I needed adapter 3 but I really do not know what I need apparently. I only need it for my 272d, I would not be using on other equipment

The Comm Adapter 3 was introduced on the market around 2012-13, around the time your machine was built. That being the case a Series 2 adapter should work OK, but I suggest that you need to confirm that information before purchasing one. Either that or keep searching, a Comm Adapter 3 will pop up for sale sooner or later.

Nige said: The Comm Adapter 3 was introduced on the market around 2012-13, around the time your machine was built. That being the case a Series 2 adapter should work OK, but I suggest that you need to confirm that information before purchasing one. Either that or keep searching, a Comm Adapter 3 will pop up for sale sooner or later. Click to expand... I have purchased 5 "aftermarket" adapters and sent them back in an attempt to connect to my truck with CAT engine. I have also purchased an "on road" cable for it but have not been able to get the adapter to power on. I tested the plug for power and ground and have both where they should be. The only thing I can't determine is which is power and ground on the end of the cable where it plugs in to the adapter. There is power and ground through the cable but not sure if they are going to the right pins in the adapter.