
	B20 Comm Port A or B			MultiFunction Printer
	Protective Ground	1 <>	37	Protective Ground
				_          _
		                  +>	34	Serial Cable
		                  |
		                  +>	33	jumper (Ground)
	Receive Data	3 <>	18	Transmit Data
	Transmit Data	2 <>	16	Receive Data
	Logic Ground	7 <>	36	Logic Ground
	Data Set Ready	6 <>	17	Data Terminal Ready
	Clear to Send	5 <>	19	Ready (Fault)

Thinks we have to learn;
1) we may have to do more with the cable at the B20 end. Pins 6  8 tied together, for example.
2) what flow contol mechinism does the printer use? This may cause us to redisign the cable.
3) does this work and is it reliable? What distance are we talking about.