Function

Looks like

Notes

Time

12 34 56

The time of day. You can choose 12h or 24h format in the options menu (1). When setting, it's in 24h format (so you can tell AM from PM) and the seconds will reset to :00 when you save. The clock keeps time during power outages and compensates for temperature effects.

Date

_2 _4 _0
(for Sun 2/4)

You can choose the date format in the options menu (2). Setting is done in three stages: first year, then month, then date.
Weekdays are: 0=Sun, 1=Mon, 2=Tue, 3=Wed, 4=Thu, 5=Fri, 6=Sat

Alarm

_7 00 1_

Shows alarm time (always in 24hr format) and on/off status on 5th tube (1=on, 0=off) and by display brightness (bright=on, dim=off). Use Up to switch on, and Down to switch off. Hold Select to set time (same way as Time). When alarm sounds, press any button to snooze, or hold for 1sec (followed by a short beep) to silence the alarm for the day. Options menu lets you restrict the alarm to your workweek or weekend only. In a power outage, the alarm will remain set, but it will not sound if power is disconnected at alarm time.

Timer

__ __ _0

A countdown timer, in hours, minutes, and seconds; or 0 when stopped. Can be set to the minute, up to 18 hours. Begins running as soon as you set it, and will continue to run in the background if you change to a different function. To cancel while running, hold Select. When timer runs out, press Select to silence. If power is lost, the timer will reset to 0. Can be configured to work as an interval timer in the options menu (10).

Day counter

_1 23 __

Shows the number of days until/since a date you specify. Set the same way as Date.

Temperature

__ 38 25

Shows the temperature of the onboard DS3231 chip (e.g. 38.25°C ). Negative temperatures indicated with leading zeroes.

Tube tester

88 88 88

(Disabled by default.) Cycles through all the digits on all the tubes.

Option

Settings

General

1

Time format

1 = 12-hour
2 = 24-hour
(time-of-day display only; setting times is always done in 24h)

2

Date format

1 = month/date/weekday
2 = date/month/weekday
3 = month/date/year
4 = date/month/year
5 = year/month/date
Note that four-tube clocks will display only the first two values in each of these options.

3

Display date during time?

0 = never
1 = date instead of seconds
2 = full date (as above) every minute at :30 seconds
3 = same as 2, but scrolls in and out

4

Leading zero in hour, date, and month?

0 = no
1 = yes

5

Digit fade

0–20 (in hundredths of a second)

6

Auto DST

Add 1h for daylight saving time between these dates (at 2am):
0 = off
1 = second Sunday in March to first Sunday in November (US/CA)
2 = last Sunday in March to last Sunday in October (UK/EU)
3 = first Sunday in April to last Sunday in October (MX)
4 = last Sunday in September to first Sunday in April (NZ)
5 = first Sunday in October to first Sunday in April (AU)
6 = third Sunday in October to third Sunday in February (BZ)

7

LED behavior

0 = always off
1 = always on
2 = on, but follow night/away modes if enabled
3 = off, but on when alarm/timer sounds
4 = off, but on with switched relay (if equipped)
(Clocks with LED control only, UNDB V9+)

8

Anti-cathode poisoning

Briefly cycles all digits to prevent cathode poisoning
0 = once a day, either at midnight or at night mode start time (if enabled)
1 = at the top of every hour
2 = at the top of every minute
(Will not trigger during night/away modes)

9

Temperature format

0 = Celsius
1 = Fahrenheit
(Clocks with temperature function enabled only)

Alarm

10

Alarm days

0 = every day
1 = work week only (per settings below)
2 = weekend only

11

Alarm signal

0 = beeper
1 = relay (if in switch mode, will stay on for 2 hours)
(Clocks with both beeper and relay only)

12

Alarm beeper pitch

Note number on a piano keyboard, from 49 (A4) to 88 (C8). Some are louder than others!
(Clocks with beeper only)

13

Alarm snooze

0–60 minutes. 0 disables snooze.

Timer

20

Timer interval mode

0 = count down and stop
1 = count down and restart (interval mode)
(Clocks with beeper and/or pulse relay only)

21

Timer signal

0 = beeper
1 = relay (if in switch mode, will stay on until timer runs down)
(Clocks with both beeper and relay only)

22

Timer beeper pitch

Set the same way as the alarm pitch, above
(Clocks with beeper only)

Strike

30

Strike

Make noise on the hour:
0 = off
1 = single beep
2 = pips
3 = strike the hour (1 to 12)
4 = ship's bell (hour and half hour)
Will not sound during night/away modes (except when off starts at top of hour)
(Clocks with beeper or pulse relay only)

31

Strike signal

0 = beeper
1 = relay
(Clocks with both beeper and pulse relay only)

32

Strike beeper pitch

Set the same way as the alarm signal pitch, above. If using the pips, 63 (987 Hz) is closest to the real BBC pips frequency (1000 Hz).
(Clocks with beeper only)

Night mode and away mode

40

Night mode

To save tube life and/or preserve your sleep, dim or shut off tubes nightly when you're not around or sleeping.
0 = none (tubes fully on at night)
1 = dim tubes at night
2 = shut off tubes at night
When off, you can press Select to illuminate the tubes briefly.

41

Night starts at

Time of day.

42

Night ends at

Time of day. Set to 0:00 to use the alarm time.

43

Away mode

To further save tube life, shut off tubes during the day when you're not around.
0 = none (tubes fully on during the day)
1 = clock at work (shut off all day on weekends)
2 = clock at home (shut off during work hours)
When off, you can press Select to illuminuate the tubes briefly.

44

First day of work week

0–6 (Sunday–Saturday)

45

Last day of work week

0–6 (Sunday–Saturday)

46

Work starts at

Time of day.

47

Work ends at

Time of day.