xd2w@VM.CC.PURDUE.EDU (Bruce Ide) (03/16/89)
Ok, This is what I have so far: Got this vector 4 and a samsung modem and a RS-232 cable between the two. I have the RS232 plugged into the far right serial port (The one marked serial com.) When I turn the modem on after I've powered up the computer, all the lights that should come on come on, but SD and RD also come on. I used config to initialize the modem port, so that is not the problem. I hooked the modem to the other port to see if the labeling was wrong, but though just the right modem lights come on, my terminal software (Mainly KERMIT, though I have mex and mdm700 too). A consultant here thinks maybe my RS232 read/send pins are in the wrong order. Could this be causing my problem? I know the modem works because I tested it on an IBM PC. I have three hypotheses right now: 1) My computer was damaged in the mail, 2) Got the wrong port or software, 3) The RS232 pins are in the wrong order. Now, if my computer was damaged, the self test that it goes through before booting should tell me. Would either of the other two be causing my problem?
jlaiho@cc.helsinki.fi (Trucker) (03/22/89)
In article <8903152308.AA08503@ucbvax.Berkeley.EDU>, xd2w@VM.CC.PURDUE.EDU (Bruce Ide) writes: [Some lines deleted] > mdm700 too). A consultant here thinks maybe my RS232 read/send pins are > in the wrong order. Could this be causing my problem? I know the modem > works because I tested it on an IBM PC. I have three hypotheses right > now: 1) My computer was damaged in the mail, 2) Got the wrong port or > software, 3) The RS232 pins are in the wrong order. Now, if my computer > was damaged, the self test that it goes through before booting should > tell me. Would either of the other two be causing my problem? About the serial ports in Vector 4: Serial printer port and serial comm. port are made of exactly the same hardware, only the pins 2 and 3 (xmit and receive) are in different order. So, in order to use a modem via the serial printer port you must make a cable (or adapter) with wires 2 and 3 crossed. Then you must modificate your terminal program's port definitions (I hope you have the source!) so that instead of reading/writing via the serial comm. the terminal program reads&writes via the serial printer port. Juha Laiho jlaiho@cc.Helsinki.FI (The Internet) jlaiho@finuh.bitnet