Testing Serial-Line UPSes

The diagram above represents the Female end of the cable. The male end is the same, but looking from inside the cable.

DTE : Data Terminal Equipment (i.e. computer)

DCE : Data Communications Equipment (i.e. UPS)

RxD : Data received; 1 is transmitted "low", 0 as "high"

TxD : Data sent; 1 is transmitted "low", 0 as "high"

DTR : DTE announces that it is powered up and ready to communicate

DSR : DCE announces that it is ready to communicate; low=modem hang-up

RTS : DTE asks DCE for permission to send data

CTS : DCE agrees on RTS

RI : DCE signals the DTE that an establishment of a connection is attempted

DCD : DCE announces that a connection is established

Ioctl to RS232 Correspondence

#define TIOCM_LE	0x001
#define TIOCM_DTR	0x002
#define TIOCM_RTS	0x004
#define TIOCM_ST	0x008
#define TIOCM_SR	0x010
#define TIOCM_CTS	0x020
#define TIOCM_CAR	0x040
#define TIOCM_RNG	0x080
#define TIOCM_DSR	0x100
#define TIOCM_CD	TIOCM_CAR
#define TIOCM_RI	TIOCM_RNG
#define TIOCM_OUT1	0x2000
#define TIOCM_OUT2	0x4000

If you have a serial-line UPS, there are some tests you should run before the general ones described in the Testing (see Testing Apcupsd) section.

To test your computer’s connection with a serial-line UPS, you ﬁrst need to establish that the serial line is functioning, and then that the UPS is responding to commands. This can be a bit tricky, especially with a dumb voltage-signalling interface, because it is completely quiescent when there are no commands being passed, and the command repertoire doesn’t include any self-tests.

Because it is easy to conﬁgure a serial cable incorrectly in such a way as

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UPS control system specifications

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APC UPS control system manual Testing Serial-Line UPSes, Ioctl to RS232 Correspondence

Models: UPS control system

Ioctl to RS232 Correspondence

Testing Serial-Line UPSes

UPS control system specifications