GE 90-30/20/Micro manual Parameter Block Contents, To Change/Read Date and Time Using BCD Format

4

Parameter Block Contents

Parameter block contents for the different data formats are shown on the following pages. For both data formats:

∙Hours are stored in 24-hour format.

∙Day of the week is a numeric value:

Value	Day of the Week
1	Sunday
2	Monday
3	Tuesday
4	Wednesday
5	Thursday
6	Friday
7	Saturday

To Change/Read Date and Time Using BCD Format:

In BCD format, each of the time and date items occupies a single byte. This format requires six words. The last byte of the sixth word is not used. When setting the date and time, this byte is ignored; when reading date and time, the function returns a null character (00).

High Byte		Low Byte
1 = change	or	0 = read	address
1			address + 1
month		year	address + 2
hours		day of month	address + 3
seconds		minutes	address + 4
(null)		day of week	address + 5

Example output parameter block: Read Date and Time in BCD format (Sun., July 3, 1988, at 2:45:30 p.m.)

	0
	1
07		88
14		03
30		45
00		01

GFK-0467K Chapter 4 Series 90-30/20/Micro Instructions Set 4-147