I salvaged a 20x2 VFD (VFD29-2002I) from a cash register machine; this was used for the $amount display on a pole beside the cash registered. The VFD itself is mounted to a Logic Controls circuit board, model LD9-PD3-7), part of the LD9000 series I believe.
Here is a LD9000 user manual PDF for the Logic Controls pole unit, using the VFD: http://www.bematechus.com/web/Documents/LD9_UM.pdf
There is a cable that has a DB9F connector at one end (to plug to computer) and the other is an 8-wire either-net type (phone jack) type plug that connects to the circuit board.
Page 11 of the LD9000 user manual indicates the pin layout of the DB9 connector (8 wire version):
1. DCD (tied to pins 4&6 )
2 TXD to PC
3 RXD from PC
3. DTR (tied to pins 1&6 )
5. DSR (tied to pins 1&4 )
6. RTS (tied to pin 8 )
7. CTS (tied to pin 7 )
- Can the arduino UNO talk RS232 directly to this device (with libraries) or do I need to use ardware for RS232 conversion to TTL ?
- what does it mean (tied to pins 4&6) ? Does this mean a wire jumpers pin 1 to both 4 & 6?
If anyone has general comments on strategy to use this VFD with my arduino I'd appreciate your feedback.