Measurement-computing PC104-PDISO8 Manual de usuario descargar pdf (Pagina 10)

Table 3-3. Control Byte Example

171AB

1111110

2122121

0040042

8188183

001600104

32132201205

006400406

1281128801807

WEIGHT

ON=1DECIMALWEIGHTON=1HEXRELAY

If the relay status byte is read back, it is in the same format.

The isolated inputs are read in this format as well. To disassemble the byte and

determine the state of the isolated inputs or the relay read back register, perform the

following operation in software:

Table 3-4. Register Read-Back

11INPUT 0/RELAY 0

22INPUT 1/RELAY 1

44INPUT 2/RELAY 2

88INPUT 3/RELAY 3

1610INPUT 4/RELAY 4

3220INPUT 5/RELAY 5

6440INPUT 6/RELAY 6

12880INPUT 7/RELAY 7

DECIMAL

HEXINPUT/RELAY

3.2 OUTPUT REGISTER

The output register is located at the base address (BASE + 0).

WRITE = CONTROL: Write a byte to the register to control the relays. A one in the

relay bit position turns the relay.

READ = STATUS: Read the status of the relay control register. A one in the relay

bit position indicates the relay is on.

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 19 20

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Measurement-computing PC104-PDISO8 Manual de usuario Pagina 10