ADLINK PCI-7442 - Manual (Page 70)

58 Register Format
You may read the isolated DO statuses from the registers. To read
the 128-bit DO statuses, you must first send the Read Back Start
(All Ch., Port0, Port1) command. You can then read back isolated
DO Read Back Register offset in turn if DO read back procedure is
standby.
You do not have to set the register value for the Isolated DO Read
Back Start (All Ch., Port0, Port1). You only need to send out the
address (BASE + 0x00h, BASE + 0x02h, BASE + 0x0Ch) in Read
mode before reading all 128-bit (all channels)/64-bit (port0, port1)
channel output data.
When the DO bank receives the Start command, the 64-/128-bit
DO data readback procedure proceeds. You can check if the DO
readback procedure is finished by get nDO_RBReady flag status
Port0: Isolated digital output channel range from bit0 to bit63
Port1: Isolated digital output channel range from bit64 to bit127
All Ch.: Isolated digital output channel range from bit0 to bit127
Address R/W Value Mapping (MSB----LSB)
BASE+0x00h R All CH Read Back Start
BASE+0x02h R Port 0 Read Back Start
BASE+0x0Ch R Port 1 Read Back Start
BASE+0x04h R IDO[15...0]
BASE+0x06h R IDO[31...16]
BASE+0x08h R IDO[47...32]
BASE+0x0Ah R IDO[63...48]
BASE+0x0Eh R IDO[79...64]
BASE+0x10h R IDO[95...80]
BASE+0x12h R IDO[111...96]
BASE+0x14h R IDO[127...112]
Bit value: 0: Output PowerMOSFET is OFF. (Initial value)
1: Output PowerMOSFET is ON.