George Gallen wrote: > what is on the other side of the tty port? a modem or device? If a modem, what > is on the other end of the modem? Is this a PPP/SLIP or just system <-> > system.
This is part of an effort to interface with a Squirrel POS system. The tty port connects to a Systech brand "serial port server". It's a box that sort of converts serial to Ethernet. It has an IP address that is known by the Squirrel server. Data going back and forth between the two systems is sent over the network between the server and the serial port server. It's then converted to/from serial. The interface protocol defines the structure and content of the messages between machines. It's all based on serial communications, with ASCII characters used to control the signaling (ENQ, ACK, NAK, STX, ETX, etc). Until now, I've been frustrated in my attempts to get the Squirrel system to understand my ACK response to its ENQ. It usually figures it out after the fourth or fifth try, but by then it's too late. Working with Squirrel support, I learned that the buffer had data other than my ACK in it when it arrived. I tried using the DELAY parameter on the LINE.ATT command and suddenly Squirrel understood the ACK on the first try. The Unidata manual says: "Warning On some platforms, you must specify DELAY in LINE.ATT to avoid problems with subsequent UniBasic SEND commands overlaying data". So, I guess I'm having problems with my SEND commands overlaying data. Now I'd like more detail on what this means and how to get around it. (And to think, some people get to play around with UniObjects and other cool things!) Dana Baron System Manager Smugglers' Notch Resort ------- u2-users mailing list [email protected] To unsubscribe please visit http://listserver.u2ug.org/
