Lynxmotion Tech Support

Jim. Thanks. Have ordered another controller from Active Robots. Will test on my return on June 29th. Will send the one I have now for testing too.

Just FYI: The Sparkfun 5V FTDI Serial USB adapters work with the SSC32.

I am using SSC-32, AL5D arm and serial to USB adapter from Lynxmotion and started from this power configuration:
- separate power for the SSC-32 board (wall power 7VDC)
- VS1=VL jumper removed,
- 5V from PC (the PC, connected via USB-serial to SSC-32) for servo powering
And all OK with it, all works fine!

BUT

When I obtained 6V DC separate wall power supply, I can’t get answer from SSC-32 even to my ‘ver’ command. Configuration is:
- separate power for the SSC-32 board (wall power 7VDC)
- VS1=VL jumper removed,
- 6VDC from wall power for servo powering

I found out that even without servo powering:
If I connect ground from my PC to the VS1 servo ground – all OK with communication.
If I disconnect this ground, I have not answer from SSC-32 to my ‘ver’ command.
When I connect ground again - all OK again.

Any help will be appreciated.

Generally speaking, unless you have done some additional wiring, I don't think this should be happening (but I don't have a Lynxmotion adapter, just the usual cheap ones). You probably need to disconnect the ssc-32 from the computer and then trace out the power for VL and VS to see where the power issue is.

I have done it and now I see:
Power config:
- separate power for the SSC-32 board (wall power 7VDC)
- VS1=VL jumper removed,
- NO ANY other power (VS1, VS2...) connected
If I join shield of the SSC-32 serial connector with the SSC-32 ground - I have correct reply after ‘ver’ command and all ok.
If I disconnect this join, I have not answer from SSC-32 to my ‘ver’ command (sometimes 'Processor Good LED' shows that SSC-32 receive data from computer, but it seems computer can't get answers from SSC-32).
I've checked it on the two different computers with the same result.

I see that ONLY #5 pin of the serial connector on the SSC-32 joined with the SSC-32 ground. BUT USB to serial adapter has not ground on this pin!

Should I permanent connect shield of the SSC-32 serial connector with the SSC-32 ground?
Which could be disadvantages at this decision?

Going to need to see some images of your wiring in order to help. From your description it should not need the connection.

Ok, remove the wire from DB9 shield and PC case. Put a volt meter on the VL terminals right on the board, meter leads direct to the tops of the screw heads. Tell me what you see. 7vdc?

I'd check to see if the solder connection between the ssc-32 db9 pin #5 ground and the ssc-32 ground trace on the board is broken or bad.

Yes, exactly 7VDC from laboratory power supply, and green LED lights after power on.


This connection ok, but as I written there is no PC ground on #5 pin of the USB to serial adapter.

Ok I have read through this again from the beginning. So the board powers up fine but will not receive commands, right? At first I was thinking it was a power issue. But I now see you are saying the USB to Serial has no ground. I checked one on the shelf and it does have a connection from USB shield, DB9 shield, and Pin 5. However note there is no ground connection on the DB9 shield on the SSC-32. It's only ground connection is on pin5. This is probably an effort to eliminate ground loops, and is not a problem. It's looking like the USB to serial is the culprit. As you mentioned you can just make the ground connection and you are up and running.

I disassembled my new UC232R-10 USB-Serial Adapter and yes, I have found the wiring track on the board from the general ground and pin #5 of the DB9 RS232 COM connector.
Unfortunately this wiring track has defect. As a result I have not PC ground on the pin #5 and this FTDI Chip product doesn't work proper
I've restored this wiring track on the adapter board and all works fine now.
It's a very pity that FTDI Chip doesn't test its products properly.

Anyway thanks all Lynxmotion guys for the quick help!

Good find! I'm glad you got it working!

My robot doesn't seem to work at all.

It was working fine this morning. Then I put it away in the box. I took it out of the box to start working on my project, it isn't doing anything. I am so tensed. Someone help me. There is no power to the robot. Seems like the adaptor is working fine. What else can be the problem.

Is it the SSC-32 circuit box?

I need help in sorting it out. I will be doomed if I can't get it working. Somebody please help me.

Hi listedunlisted,

First thing you need to do is start your own troubleshooting thread. Please provide much more information. You didn't even tell us what kind of robot it is... Please use part numbers and provide much more detailed information.