Some clarifications are needed:
 
Are you connecting to the SRV BFin controller board direct through the serial port or through the Matchport radio (Radio/Motor board)?
 
If direct through serial are you going through UART1 or 2?
 
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Are you open to try and figure out what is up with the radio first? We can get connected easily if the radio works.
 
What is the radio doing/not doing? How do you connect to the radio to check/change settings?
 
 
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And just to make clear, not UART over wireless of course. I suspect the Matchport to be failing, so that's pretty pointless. I want the real thing, I want to know to which pins I can connect physically. And I don't have the extension board. So I don't have the S32 connector.

A couple of things.
 
First, if you are using an SRV you have an S32 header. It is the 2x16 row of pins sticking out the bottom at the end of the board opposite the camera (which attaches to an S32 socket... holes instead of pins).
 
Next, the function of each pin is easily determined through the SRV-1 schematic (found on the Surveyor website under the Blackfin Camera link from the left menu... just scroll down once you have entered the Blackfin Camera link and you will find a link to schematics).
 
Now, to connect to anything you will either need to make connectors or solder leads depending on if you have access to the actual header pins or just the tails. If you are using a radio/motor board you can make connections to the header pins coming through the board (this is what the expansion board connects to... again an S32 header).
 
 
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