mge-utalk

NAME

mge-utalk - Driver for MGE UPS SYSTEMS UTalk protocol hardware

NOTE

This man page only documents the hardware-specific features of the mge-utalk driver. For information about the core driver, see nutupsdrv(8).

SUPPORTED HARDWARE

mge-utalk supports the following models:

    Pulsar Evolution (Serial port),
    Pulsar ESV+,
    Pulsar ES+,
    Pulsar EL,
    Pulsar EX,
    Pulsar EXtreme C,
    Pulsar / Comet EXtreme,
    Comet / Galaxy (Serial card)

EXTRA ARGUMENTS

This driver supports the following optional settings in the ups.conf(5):

LowBatt=value: Low battery level below which LB is raised, in % (default 30%)
OnDelay=value: Set delay before startup, in minutes (default 1 minute)
OffDelay=value: Delay before shutdown, in seconds (default 120 seconds)
oldmac: Set this flag if you are running Linux on an Oldworld Macintosh box (all beige Apple Macintosh). This might also be needed for other OSs (like *BSD) running on PowerMac.

IMPLEMENTATION DETAILS

Not all MGE UPS models provide all possible information. mge-utalk checks on startup which variables and commands are available from the UPS, and re-reads these regularly. Thus, startup is a bit slow, but this should not matter much.

mge-utalk.h defines a struct array that tells the driver how to read variables from the UPS and publish them as NUT data.

"ups.status" variable is not included in this array, since it contains information that requires several calls to the UPS and more advanced analysis of the reponses. The function get_ups_status does this job.

Note that MGE enumerates the status "bits" from right to left, i.e., if buf[] contains the reponse to command "Ss" (read system status), then buf[0] contains "bit" Ss.1.7 (General alarm), while buf[7] contains "bit" Ss.1.0 (Load unprotected).

enable_ups_comm() is called before each attempt to read/write data from/to the UPS to re synchronise the communication.

KNOWN ISSUES

Repetitive stale status - Loss of communication

Older models, such as ES/ESV ones, might report repetitive "data stale" errors. This is due to the fact that these models doesn't support too much polling. To solve this problem, add "pollinterval=20" in ups.conf, and change the value of MAXAGE to 25 in upsd.conf, and DEADTIME to 25 in upsmon.conf.

TODO LIST

Sort out OFF/OL issues: OFF is set according to Ls.2.7, but maybe this interpretation is in conflict with the NUT interpretation of the OFF flag?
Add PowerSave support (selectable plug number for commands): ON/OFF/REBOOT commands can act either on outlet 1, 2 or main (1 + 2). This features depends on the UPS model. This would also allow to support UM-Switch (smart outlet).