Agco Trimble GPS speed signal Ag382 receiver

[Massey 6470]

Trying to get a GPS speed signal from this receiver on a t5 MF6718
To my knowledge the 7pin plug in the cab is speed sensor and not GPS, has any body got a true GPS signal to connect to a control box .

 

[Soon_60]

Maybe try AgRemote program to modify settings:
>Configuration v >>>>>..Rec Config v Radar v Radar Scaling

Google for: 372 trimble user guide

 

[Will Blackburn]

On older models there is a plug under the RH console in front of the B pillar. We have one connected to a Tellus.

 

[Massey 6470]

On older models there is a plug under the RH console in front of the B pillar. We have one connected to a Tellus.

That’s the rs232 socket

 

[Will Blackburn]

That’s the rs232 socket

Does that not do the job?

 

[Will Blackburn]

Does that not do the job?

It's only connected to the 7 pin plug otherwise, so one of them supplies GPS speed?

 

[Robt]

That’s the rs232 socket

Yes, the nmea or rs232 is the plug you need

 

[Massey 6470]

There must be a special lead required between the krm box and the tractor rs cable as I tried before with a 232 cable and nothing happened

 

[Will Blackburn]

There must be a special lead required between the krm box and the tractor rs cable as I tried before with a 232 cable and nothing happened

We had to have a little thing in-between that "reverses" it or something to make it work.

 

[Massey 6470]

We had to have a little thing in-between that "reverses" it or something to make it work.

Do you know where you got that cable

 

[Will Blackburn]

Do you know where you got that cable

Dealer sourced it, i'll take a photo tomorrow.

 

[Will Blackburn]

 

[Massey 6470]

Surely that adapter is just changing it from male to female

 

[Will Blackburn]

Surely that adapter is just changing it from male to female

Frustratingly there are multiple different cross over protocols, because simply bringing them together doesn't match the pins.

 

[Lofty1984]

I was hoping that nmea would allow our fert box to talk to the fieldstar or datatronic screen

 

[Soon_60]

A null modem is different from a gender change. Seems to be a Null Modem in the picture. It does a cross between the pins 2 & 3 (receive data RX and transmit data TX) between the ends of the plug / cable Does other cross over also, but we do not need them now. A gender changer would just puts 1->1 ... 9->9 Plug to Receptable = Male to Famele.

As explained in simple Google search:

There are several classes of null modem cables, each with many variations: Minimum 3- or 4-Wire Cable. In this cable, RD and TD are cross connected and Signal Ground goes straight though (and optionally also Frame Ground). Such a cable provides no hardware flow control and no monitoring of the connection.

And also with pictures:

Pinouts of various connectors

With most of the position & velocity NMEA data stream we do not want any flow control. So only RX TX and GND (=ground) must be hooked. Just get the baud rate etc right.

The original question of Massey 6478 asked for GPS-speed from Ag 382. And it (also to my knowledge) is available from pin 7 of both of the 12 pin Deutsch connectors of the receiver. And it's settings can be changed by using AgRemote software (by Win PC or some Ag displays that have it "built in"). So I'm sorry if I confused any of You. I understood that the original question was "how to get real GPS speed instead of tractor reported wheel speed". The difference in between is wheel slippage.
Speed is a scalar kph, mph, m/s... Velocity is a vector with speed and direction...