I have a few robotic manipulators from NakkaNippon Electric and I'm trying to communicate with them using RS232 without success. The robot model are microrobots 88-4 or 88-5.

I'm sending commands via COM port, but I can't received anything from the box. I'm using a USB-to-DB9 converter (FTDI) with a DB9-DB25 cable.

On the net, the only reference I have for the robot is from an old post from year 2000 that was from user @peterkneale.

If it can help, here is the link to the scanned PDF manual.

You can see the commands on page 23-24 of the pdf (page 21-22 in document).

Any advice would be grateful


closed as unclear what you're asking by Mark Booth Feb 24 '16 at 19:27

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  • $\begingroup$ Have you tried contacting the manufacturers? $\endgroup$ – Paul Feb 22 '16 at 23:09
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    $\begingroup$ Have you tried different COM port settings (baud,stop bits,parity)? $\endgroup$ – Octopus Feb 22 '16 at 23:09
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    $\begingroup$ p20 says it's 1200/8/N/1 (with a jumper to change baudrate). $\endgroup$ – Octopus Feb 22 '16 at 23:15
  • $\begingroup$ @Octopus, yes i have tried with the default baudrate. There's also something about DTR (or similar acronym). $\endgroup$ – NickB Feb 23 '16 at 4:58
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    $\begingroup$ "something about DTR" is significant with RS232. One device is Data Terminal, the other is Data Set. You might need to use a crossover cable to get the wiring correct. If you're lucky you could use a null modem cable, but since they mention DTR you probably need a full crossover cable. If the robot is DTR your side should be DSR, and vice versa. This site shows you pinouts and data flow control: tldp.org/HOWTO/Serial-HOWTO-19.html $\endgroup$ – SteveO Feb 23 '16 at 14:02

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