The Question is:
We are trying to connect a DEC LA100 (Letterwriter 100,model: LA100-BA) console
terminal directly to one of the 2 serial ports (TTA0: & TTB0:) of an DS-10
Alpha. We were able to use the LA100 as a printer but not as terminal. Can
this console work as a te
rminal for the DS-10?
Can these 2 serial ports of the DS-10 (TTA0: & TTB0:) be used directly as
RS-232 serial communication ports to communicate with third party hardware
Thanks a lot.
The Answer is :
The AlphaStation DS10 and the AlphaServer DS10 series provide serial
communications connectivity through these two ports, and -- when the
console is configured for SERIAL operations via the SRM console
variable CONSOLE setting -- can also provide console operations on
the serial port.
Details of serial line pinouts and of connecting and using the console
ports are discussed in the OpenVMS Frequently Asked Questions (FAQ)
document. The choice of which of the two ports -- COM1 or COM2 -- will
be used as the console can vary, as well. The AlphaStation DS10 and
AlphaServer DS10 series both use the PC-compatible DB9 pinout.
As has been discussed in the modem topics elsewhere here in the Ask
The Wizard area, you will want to acquire and to use a communications
debugging tool such as a serial line breakout box or another similar
serial line analyzer.
Serial communications are certainly possible with these ports, though
high-volume transfers and binary-mode data transfers are not recommended
on any VAX or Alpha console serial line. These ports are generally
intended for low-speed (usually 19200 baud or lower, depending on the
particular port and port hardware) interactive use.
The AlphaStation XP900 is very similar to the AlphaStation DS10 and
the AlphaServer DS10 series, and the above information is applicable.