RITRON DTX-450 RADIO MODEM PROGRAMMING ???

[RFI-EMI-GUY]

I have a small collection of Ritron DTX-450 radio modems I need to program to new frequencies. I have the software and it is installed in a Win XP computer. I do not have the "proper" cable to program these radios but I understand it is a "one wire" bidirectional bus.

Has anyone any experience programming these? I don't want to "brick them". I see that the program asks to read the radio first so I assume a successful read will result in a successful write.

Anything I need to watch out for? Can I use same cable I might use for other "one wire" programming products? I Have an RT systems cable (USB) for Icom W32A, I have been thinking it may work.

 

[byndhlptom]

The service manual I have shows that the programming pin is diode protected to the +5v line, so as long as your voltage swing is GND tot 5 v, you should be OK. I am looking for a schematic of the programming module, I have it "somewhere"..... will post copy when I find it.

 

[RFI-EMI-GUY]

Thanks that will be helpful. I don't want to brick these as they are becoming hard to find.

 

[byndhlptom]

Here are the programmer schematics....

 

[RFI-EMI-GUY]

Thanks! Is this like their standard RIB type interface? I think the other part is a cable with a mating six pin modular connector terminating in a "phone" jack that plugs into the radio module mike or speaker jack and uses ground plus one bidirectional lead. Does that imply that RxD and TxD are simply tied together? I am thinking I can do same with a Motorola RIB as it has similar circuit.

 

[byndhlptom]

I also have the manual (includes schematics), but they are too large for the server. send me a pm with email and I can send it to you

 

[byndhlptom]

That may not be the correct programmer for the 450 series.... I'm still looking....

 

[RFI-EMI-GUY]

We crossed in the mail on that. Yes I think there is more.

 

[byndhlptom]

I found some notes that indicate that Ritron just tied the TX & RX lines together. That may be the "secret".

I would venture a guess that any of the serial to one line programmers that are 5V output level would work....

Good luck

$.02

 

[RFI-EMI-GUY]

I sent a message to your "profile". I am not sure if that is same as a PM in the new forums.