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CCIT X.25 solution wanted

CCIT X.25 solution wanted

CCIT X.25 solution wanted

I have set up an RS-485 network consisting of a host and three nodes. The host is a PC/AT Pentium class microcomputer which attaches to the network through its serial [com] port and an Advantech ADAM4520 RS-232 to RS-485 converter module. Legacy CNC controllers make up the three nodes connected to the network through Advantech ADAM4521 addressable RS-485 to RS-232 converters.

Two of the three nodes are displaying over-run errors accompanied by random data loss / corruption. These
two problematic CNC controllers have limited CCIT capability; i.e., highest speed == 4800 baud, fixed [if any]
parity checking. OEM: Yasnac MODEL: MX3. The third node has demonstrated no errors or data loss; a
relatively more advanced machine. OEM: Okuma, MODEL: OSP5020L.

We are using a terminal emulation application [Qmodem] at the host using generic ASCII to send the text files, no protocol at present. All nodes are set to the same parameter set; i.e., 4800,7,E,2, half-duplex.

Q. Is an x.25 protocol controller the answer?

Any suggestions or comments welcome and appreciated.

Sr. Controls Engineer
American Baler Company

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