Automatic Tester for Printer-Sharing Device
Original Publication Date: 1985-Feb-01
Included in the Prior Art Database: 2005-Feb-18
The method of the present invention allows a printer-sharing device 10, designed to share a current loop printer among four PCs (personal computers) to be 100% functionally tested automatically using one PC and four wrap plugs. The present testing method replaces the previous method which required four PCs. Using the present method a PC tester 12 is connected to the printer port 14 of the printer-sharing device 10 while four wrap plugs 16, 18, 20 and 22 are connected to channels one, two, three and four of the printer-sharing device 10. The printer sharing device 10 is tested by the following algorithm: 1) A broadcast signal (Hex 80) is sent from the PC tester 12 to the printer-sharing device 10. 2) The broadcast signal enables the channel one receiver.