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i was communicating a micrologix 1200 with HMI (PANEL VIEW 550) through RS232 DB9 connector. i found that the 9 pins of the connector cable is actually having only 3 wires inside connected to pin 2,5&7. can some 1 clear me on why other poins have not been used and when should we use the same.
thanx in advance
yash verma
yash.arya11 @ rediffmail.com
thanx in advance
yash verma
yash.arya11 @ rediffmail.com