Author: hpfcso.FC.HP.COM [Ray Depew] Date: Thu Dec 19 1991 In comp.sys.hp48, robf@mcs213g.cs.umr.edu (Rob Fugina) writes: > I just bought the serial interface kit, and I can't get anything to work! > I set the right port, speed, and parity on the computer, and I set the > 48 to wire, ascii, and the same baud and parity as the computer. Nothing > seems to happen! The only thing that I can get to happen (sometimes) is > when the computer is in terminal mode and I put the 48 in server mode, > the computer will receive 4-6 characters (that I recognize as the 48 > telling the computer it's in server mode). Is there any way to test the > connection? Does the computer's com port need to be set for DCE or > something??? HELP!!!!!!!!!! > > Rob robf@cs.umr.edu 1) To test the connection without Kermit getting in the way, type "connect" at the 'Kermit >' prompt on your computer, or use a dumb terminal. a) To test the computer->48 connection: - press OPENIO on the 48. - type HELLO on the computer and press RETURN/ENTER/whatever. - press BUFLEN on the 48 (last pg. of the I/O menu). - you should see two numbers on the stack. Level 1 is a flag: 1 := data transferred o.k. 2 := framing error or UART overrun Level 2 is the number of characters received from the computer. - press DROP to remove the flag and put the # of char's into Level 1. - press SRECV on the 48 (last pg. of the I/O menu). - you should see two numbers on the stack. Level 1 is a flag: 1 := data transferred o.k. 2 := unsuccessful receive. (press ERRM for more detail) Level 2 should be the string received from the computer. b) To test the 48->computer connection: - (Assuming you already pressed OPENIO) - put a string like "HI BACK" on Level 1 of the 48. - press XMIT on the 48 (last pg. of the I/O menu). - if data transfer is successful, you will see a 1 on Level 1. - if part of the string failed to transmit, you will see a 0 on Level 1 and the unsent portion of the string on Level 2. 2) Remember to press CLOSEIO when you've finished. Regards Ray Depew Hewlett Packard Co, Fort Collins, Colorado rrd@hpfitst1.fc.hp.com