manual vs custom ???

[Molly_M]

custom and manual in this case ???

ручная настройка и custom DST ????

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Preset DST
When the clock is operating in the European Union or North America, the DST (control switch SW18) setting determines whether the clock automatically adjusts for Daylight-Saving Time at the appropriate preset times. Usually, you set DST during initial configuration before installing the clock in your system. Once you have selected DST, the SEL 2407 adjusts automatically for Daylight-Saving Time and provides the correct IRIG time-change notification. If you change the DST setting while the clock is powered and the clock is operating in the DST period (typically March or early April through November), then the time changes after a five-second delay. The SEL-2407 is preset with the 2006 and 2007 daylight-time changes for these regions.
Custom DST
In all areas you can use the DST ASCII command to set the time when daylight-saving time begins and ends (see DST Command (Access Level 1 and Access Level 2) on page 14). This custom daylight-time setting method must be used in areas outside the European Union and North America for implementing automatic daylight-saving time changes. For areas in the preset regions, the DST command changes the pre-programmed daylight time, which is useful where local rules differ from regional practice.
Manual DST

[sledopyt]

дайте описание Manual DST

[Molly_M]

Manual DST

When the clock is operating with no preset or valid custom daylight time, the DST setting (control switch SW18) advances the time manually by one hour when ON. When you set DST, the time changes when the seconds output reaches 00 after crossing 25 seconds. For example, if the current time is 08:09:10 when the DST setting is turned ON, the time will change at the end of the immediate minute from 08:09:59 to 09:10:00. However, if the current time is 03:45:28 when the DST setting is turned ON, the time will change at the end of the following minute from 03:46:59 to 04:47:00. The clock uses this delay to transmit the correct IRIG time-change notification sequence to downstream relays and other equipment.

[Эдуард Цой]

http://www.multitran.ru/c/m.exe?l1=1&l2=2&s=custom
выч. специальный; свой; собственный
комп. пользовательский

Смысл этих вариантов одинаковый. Какой из них выбрать - дело вкуса.

[Molly_M]

я написала custom - выборочный
manual - ручная настройка