jim (03/15/83)
I can't get any of the async ports to work, except for the first two under bizarre circumstances (lots of RS232 jumpers). First of all, DTR never gets set in spite of code in the driver to set it. Second, if DCD is not present when the open routine is called, you can't ever open the device because raising DCD apparently doesn't cause an interrupt (or at least, the driver never finds out about it). There are a set of 10 switches that go along with each of the first two RS232 ports. I can't find any place in the documentation that describes what those switches do, although there are tables giving settings for various kinds of devices you might want to connect. The ports all work fine under VMS, and all of our 730s behave the same way, so I don't think it is a hardware problem. Does anyone know how to get these ports to work, with proper modem control (DTR, DSR, DCD)? And does anyone know where I can look in the DEC documentation to find out what those switches do?