Hello,

I can't communicate with and UPS (Eaton) via a serial port. The serial port is UP and have been tested under a Windows OS.

I have set up the communication parameters and tried to establish a dialog with the UPS. Minicom is installed. Nothing appears ont the screen and the VT102 has an offline status. The OS is Red Hat Enterprise Linux 5 64bits.

dmesg | grep -i tty
serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
00:09: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A

setserial /dev/ttyS0 baud_base 9600


setserial -a /dev/ttyS0
/dev/ttyS0, Line 0, UART: 16550A, Port: 0x03f8, IRQ: 4
Baud_base: 9600, close_delay: 50, divisor: 0
closing_wait: 3000
Flags: spd_normal skip_test


stty -a < /dev/ttyS0
speed 9600 baud; rows 0; columns 0; line = 0;
intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>;
eol2 = <undef>; swtch = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R;
werase = ^W; lnext = ^V; flush = ^O; min = 1; time = 0;
-parenb -parodd cs8 hupcl -cstopb cread clocal -crtscts -cdtrdsr
-ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr icrnl ixon -ixoff
-iuclc -ixany -imaxbel -iutf8
opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0
isig icanon iexten echo echoe echok -echonl -noflsh -xcase -tostop -echoprt
echoctl echoke

yum install minicom

Is somebody have examples to debug the serial port ?

What is the model number?
You can use a loopback plug or another computer via a NULL modem cable. Configure both computers using the same settings and you should see what you type on the other computer.

Just briefly looked at the manual. Are you trying to use terminal mode?

Its a HP ML310G4 server. The serial port is onboard. I will look for about a new driver.

I meant the model number of the UPS not the server.
How did you test the UPS using windows?

it is an Eaton Extreme 3000 (formerly MGE). With windows, i installed the server with Windows 2003 Server and the UPS software (Eaton Network Management Protection). I plugged the rs232 serial cable in the server. At the first launch of the software, the UPS is monitored.

In Red Hat, it's not also so easy to drive..

Your UPS is supported by NUT.
http://www.networkupstools.org/index.html

Not all ups's are even close on how they communicate. signal and wire pairs change or reverse. Dumb things. Might have to put a scope on the windows to be sure or see if docs tell how to set serial port settings.

Settings are 9600 8N1. Standard.

NUT, yes, i've tried with this when usb and serial doesn't work. Usb is working with an other ups. The current ups has only a serial port. I will retry with NUT.