ADLINK cPCI-8554/R - Manual (Page 39)

Registers •29
3.6 Digital Output Register
This register is a general-purpose 8 bits digital output port. These signals
can be used to control external devices.
Address: BASE + 0x18
Attribute: write only
Data Format:
Bit 7 6 5 4 3 2 1 0
Base+0x18 DO7 DO6 DO5 DO4 DO3 DO2 DO1 DO0
Table 8. Digital Output Register