https://community.hpe.com/t5/operating-system-linux/linux-serial-port/m-p/3233483#M10925 Yu Ting,<BR /><BR />items found by google indicate you may need a better cable (at least for PowerChute).<BR />I searched for "Port must be configured for modem control" (quotes included).<BR /><BR />JP. Tue, 30 Mar 2004 04:26:18 GMT Jeroen Peereboom 2004-03-30T04:26:18Z https://community.hpe.com/t5/operating-system-linux/linux-serial-port/m-p/3233482#M10924 Hi, folks,<BR /><BR />I am connecting one UPS to the serial port /dev/ttyS1 of the Linux Red Hat 7.2. And I put one line below in my /etc/inittab file as required.<BR /><BR />a1:3:off:/sbin/mgetty -br ttyS1 -s 2400<BR /><BR />But when I configure the UPS software I always got the complain below:<BR /><BR />/dev/ttyS1 appears to be a local control port<BR />WARNING: Port must be configured for modem control in order to work with a "simple" Signaling UPS<BR /><BR />So my problem is how can I set serial port /dev/ttyS1 as modem control port instead of local control port?<BR /><BR />Thanks in advance!<BR /><BR />Regards!<BR />Yu Ting Tue, 30 Mar 2004 03:41:10 GMT https://community.hpe.com/t5/operating-system-linux/linux-serial-port/m-p/3233482#M10924 Yu Ting LIU 2004-03-30T03:41:10Z https://community.hpe.com/t5/operating-system-linux/linux-serial-port/m-p/3233483#M10925 Yu Ting,<BR /><BR />items found by google indicate you may need a better cable (at least for PowerChute).<BR />I searched for "Port must be configured for modem control" (quotes included).<BR /><BR />JP. Tue, 30 Mar 2004 04:26:18 GMT https://community.hpe.com/t5/operating-system-linux/linux-serial-port/m-p/3233483#M10925 Jeroen Peereboom 2004-03-30T04:26:18Z