Connectivity & Servos Non-Responsive

Lynxmotion Electronics & Software
1

I turn power on to SSC-32 and green LED lights up. I plug in USB cable which connects to SSC-32 serial port and cable indicates read/write activity. I launch LynxTerm, it connects, and the SSC-32 LED turns off indicating it got signal. I type ver in LynxTerm and get SSC32-V2.03XE as response. When moving the slider control, the SSC-32 LED blinks indicating receiving data. All looks good. Just one problem: No servos move.

I’ve been using this same PC, SSC-32, USB/serial cable, and all config settings successfully for some time, so not sure why all of a sudden servos are unresponsive even as it appears that the SSC-32 is successfully sending/receiving.

LynxTerm setup: COM6, Baud 115200, data bits 8, stop bits 1, parity none, flow control none.

COM6 port settings on PC: Bits per second 115200, data bits 8, stop bits 1, parity none, flow control none, USB transfer sizes (receive bytes / transmit bytes) 4096 / 4096, latency timer 1 msec, timeouts (min read / write) 0 / 0, serial enumerator on, serial printer off, cancel if power off is off, event on surprise removal off, set rts on close off, disable modem ctrl at startup off.

Any ideas as to why servos are non-responsive? Thanks.

2

power? Could be you have power on the VL terminal, so the logic is working, but no power on the VS1/VS2 terminals. I would check the voltages on the power pins of the servo connectors.

3

I agree with Kurte: seems like the logic is working fine but the servos may not be powered. What do you have for power sources? Do you have a single ~6 volt power source for everything (in which case the VL=VS, and VS1=VS2 jumpers should be present), or multiple sources (in which case VL=VS should not be present)?

4

Jarcand, thanks. It wasn’t the power. I tested and was getting 8.8 volts successfully. However, you were right about the jumper settings. I have power going to VS1 and VL, but not VS2. Had jumper on VS1=VS2, but not on VL=VS1. Adding jumper for VL=VS1 seems to have done the trick. Thanks.

5

Do you have one battery connected to both VS1 and VL, or two different batteries? If two batteries, are they both the same type? If not, then the VL=VS1 jumper should not be present…