How To Connect and Tips For 41 System
The HP82160A is the HP-IL module for the HP-41 series calculator. It is attached to one of the four ports on the calculator and provides functions for printing (by HP 82162A printer), storing on cassettes (by HP 82161A digital cassette drive) and general controlling interface.
In the loop, there is one controller, one listener and one talker device, or inactive devices. In the 41 system, the calculator is always the active controller. The talker is the device that is sending information to the loop and the listener is that one that receives information on the loop. At one time, there is only one talker and only one listener and one device can't play these roles at same time.
Also, each device on loop receives a sequential address, starting with #1 and up to #30. The HP-IL has an in and an out connector. So, the first device connected to the out cable from the calculator gets the address #1.
Use the SELECT (x:#address) command to determine which device is the primary device on loop (the device controller will communicate to).
Also, there is the AUTO or MANUAL mode of operation. In the AUTO mode, printer commands or mass storage commands are directed to the first device of appropriate type after the primary device. In the MANUAL mode, the communication is directed to the primary device, regardless its type. Related commands are AUTOIO and MANIO.
Note that if there is already a plug-in printer attached to calculator (HP 82143A), you must disable the Print function on HP-IL module, sliding the switch Print to off.
Read more about this topic: HP-IL
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