BP>> I'm stumped on what to try next.
DL> A different make of USB-serial converter?
I have good results with this FTDI USB-RS232c cable converter:
EasySync ES-U-1001-R100 =
This USB2 to/from RS232c converter cable has all the hardware handshake lines active in it, such as DCD, DTR, DSR, RTS, CTS, Rx, Tx, Ring, and Earth, and has golplated contacts on both the USB and RS232c sides. It als has a large temperature scale to work in good condition, very nice for using at (sailing-)ships in almost all weather. It costs about Euro 50,00 incl. VAT in the Netherlands. The fun of the (very) low price of other make conversion cables is alreay gone, when the trouble of the bad working of your cheep one continues ;-(.
FTDI= Future Technology Devices International Limited. This FTDI cable works good on all machines, like Windows, MacOSX, or Linux, even on the Raspberry Pi all models: 1B, 1B+, 2 and 3 with Raspbian Linux.
I use it for a connection between a Pi 3B and an AIS-transponder on inland ships for ECDIS with OpenCPN sailing chart viewing software on European inland waters. But of course it can be used worldwide if you download and install the OpenSaeMaps of the area you want to sail at.
For Windows you need to install the appropiate USB-RS232-driver from FTDI. There a 4 versions; two for Intel 32 bit or 64 bit, and two for AMD 32 bit or 64 bit. See: for this Virtual COM Port Drivers, and manuals if necessarry. See: for the manuals.
For the AIS transponder connection you also need a 9-pole male- female cable. You can buy that at the same store to, or solder one yourself. It must be 1:1 connected, and is necessarry because the FTDI converter cable only simulates a RS232 port as was present at old machines, i.e. with bolds on it.
There is also another version with 2 RS232 ports which works good at Windows machines, but I did not test it on a Pi. It uses the same FTDI VCP drivers. EasySync ES-U-1002-M USB-2COM-M Serial 1 (RxD, TxD, Gnd) Serial 2 (RxD, TxD, Gnd) USB-B
+5 Vdc= / 150 mAdc= So I do not think it has hardware handshaking. See: Or: I tested this version with OziExplorer and OpenCPN on a Windows XP laptop computer.
UK Office (Global Headquarters) EasySYNC Limited Unit 1, 2 Seaward Place Centurion Business Park Glasgow G41 1HH United Kingdom Tel: +44 (0) 141 418 0181 Fax: +44 (0) 141 418 0110 E-Mail (Sales): email@example.com E-Mail (Support): firstname.lastname@example.org
US Office EasySYNC Limited (USA)
7130 SW Fir Loop Tigard, OR 97223-8160 USA New! Sales and Order inquiries, call toll free: +1 (855) 531-5825 Tel: +1 (503) 547-0909 Fax: +1 (503) 547-0990 E-Mail (Sales): E-Mail (Support):
No, I do not have shares of this firm, but I hate bad quality cables for my good money. So spent a little bit more and have no troubles.
More information about ECDIS you can find here in Dutch: Infopacket selfbuilding ECDIS:
Infopacket Ships Electro:
124 schematic diagrams for ships electro.
Note: My both packages are in the Dutch NL language!. Write FidoNet mail or e-mail if you have questions.
I think the EasySync ES-U-1001-R100 is the best offer in your case. Good luck with it.