The RS232 Null-Modem Adapter changes a DSUB9 male port into a DSUB9 female connector. The Adapter is not just a Gender Changer. RS232 requires different signal positions for male and female connectors, so this adapter exchanges those positions. Don't use it for RS422/485. Null-Modem 9PF-9PF is an optional accessory for NetCom Serial Device Servers.
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