B&B Electronics 232DRIO manual Example Set Output Lines Data Byte Relays Binary Decimal

Example 3.1		Set Output Lines
	Data Byte			Relays
Binary	Decimal		Hex	Relay #2	Relay #1
XXXXXX00		0	0	de-energized	de-energized
XXXXXX01		1	1	de-energized	energized
XXXXXX10		2	2	energized	de-energized
XXXXXX11		3	3	energized	energized

Symbol: X don’t cares (default setting should all be “0”)

To energize the relays, the corresponding bit of the data byte must be set high. Conversely, to de-energize the relays the corresponding bit of the data byte must be set low.

(00000011, 3 in decimal, 3 in hex: energized both relay #1 and #2)

Example 3.2		Read I/O Lines
Data Byte Returned					Status
Binary	Dec	Hex	ASCII	Input #1	Relay #2	Relay #1
00000000	0	00	NUL	low	de-energ.	de-energ.
00000001	1	01	SOH	low	de-energ.	energ.
00000010	2	02	STX	low	energ.	de-energ.
00000011	3	03	ETX	low	energ.	energ.
00000100	4	04	EOT	high	de-energ.	de-energ.
00000101	5	05	ENQ	high	de-energ.	energ.
00000110	6	06	ACK	high	energ.	de-energ.
00000111	7	07	BEL	high	energ.	energ.

Notice that the returned data byte starts at address 00000000 in binary, 0 in dec., 0 in hex., or NUL in ASCII. From left to right (msb to lsb), the first five bits are really XXXXX “don’t cares” but are defaulted as “00000”. The remaining three bits represent input #1, relay #2, and relay#1, respectively. A “1” or a HIGH represents relay energized/input present, and a “0” or a LOW represents relay de- energized/input absent.

12	232DRIO-0308 Manual
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