An HP bidirectional parallel printer interface capable of handling 15 devices @ 500 kBps.
The maximum distance = number of devices * 2 meters with an absolute maximum of 20 meter.The above specifications seem
confusing (and they are), but it is the most accurate documentation we have!
The bus consists of one controller and 1 to 15 devices in a daisy chain fashion shown in the picture below:
An IEEE 488 device has per device 4 different addresses for Command, Listen, Talk and
Secondary. Let's say we have a plotter on address 0 then his addresses would be:
- 00 = Command Address
- 20 = LISTEN Address
- 40 = TALK Address
- 60 = Secondary Address
