haynes@hao.UUCP (Dan Haynes) (03/05/85)
I was trying to download some graphics commands from a Vax 4.2 system to an inkjet printer over a tty line. This particular printer requires a special sequence to put it in graphics mode; one of the characters in this sequence is an ascii null. All attempts thus far to get a null char output have failed. There does not seem to be any problem outputting any other control char (in RAW mode). If anyone can provide me with a clue to a method to get a null on output, please send me mail. Thanks in advance, Dan Haynes haynes%ncar@csnet-relay.arpa ARPA haynes@ncar.csnet CSNET hao!haynes UUCP
haynes@hao.UUCP (Dan Haynes) (03/08/85)
> I was trying to download some graphics commands from a Vax 4.2 system > to an inkjet printer over a tty line. This particular printer requires > a special sequence to put it in graphics mode; one of the characters in > this sequence is an ascii null. All attempts thus far to get a null > char output have failed. There does not seem to be any problem outputting > any other control char (in RAW mode). If anyone can provide me with > a clue to a method to get a null on output, please send me mail. I have solved the "no nulls on output over a tty line" problem. It turned out that the particular terminal I was testing this on, a Wyse 50, treats nulls as a no-op even in MONITOR mode. Hooking a scope up to the receive line proved this. Dan Haynes haynes%ncar@csnet-relay.arpa ARPA haynes@ncar.csnet CSNET hao!haynes UUCP