The TeleFlash instruments are interfaced via RS232 cabling. Below is a pin to pin diagram of the standard cable which is supplied with the instrument.
|DB9s (female)||DB25p (male)|
|6 & 8||6 & 8 & 20|
|4 & 5|
Note that there are four jumpers; one inside the DB9s and three within the DB25p. It appears that the jumpers serve to completly disable hardware handshake.