4/22/2021 0 Comments Hp Serial Port Pinout
After youve checked that its working, you can send some simple HGPL to the plotter.This proved to be a little bit tricky and there was very little help available on the internet, so I thought I would write a short guide for setup now that Ive got it working.
Im making the assumption that the RS232-C port on the back is being used. First, you need a specific cable configuration for the HP7475a. ![]() I recommend you either make your own, or buy the HP 24542G cable, which has the correct pinout. Hp Serial Port Pinout Manual For YourUsually this is listed as COM1, but you should check the manual for your motherboard just to be sure. Hp Serial Port Pinout Manuals For TheYou might want to try this setting for a first test, or you could take a look at the manuals for the part over at the HP Computer Museum. However, I can give a quick rundown of what each switch does, which might make the job easier. If you used the mode command above, then the baud rate youll want to set will be 9600. The manual contains a table of how the switches need to be set for baud rate, which is reproduced below. The next two switches, A3A4 and METUS select the default paper size. The table from the manual of how theyre supposed to be set is shown below. ANSI A corresponds to the typical 8.5x11 sheet of paper, while ANSI B refers to ledger paper. ISO A4 refers to a paper size larger then letter, but smaller then ledger, while ISO A3 refers to a much larger sheet of paper. The Wikipedia article on paper sizes has a nice graphic that compares the different sizes of standard paper sizes. You can see that Ive set my printer for standard 8.5x11 paper. Its used to either put the plotter in a wait for program on signal state (the Y state) or Im ready to be programmed state, or D state. We dont have much use for the Y state today, so just set it to D. That means that you dont have to send a command to it for it to understand that it need to start printing what you send it; it will just do it automatically. I didnt end up using parity bits, so I just set them to zero. Hp Serial Port Pinout How To Program InThere are numerous guides on how to program in HGPL on the web, so I wont reiterate here. But its an old format that many programs do not support anymore. Luckily, Eagle does, so if you want to print your own circuit layouts, its a good choice as any. If you hold down the P1 and P2 buttons on the front while turning it on, the plotter should print a test plot.
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