Measurement Computing PCM-DAS08 - Manual (Page 12)

BASE + 1 - A/D MSB (4 bits)
Read data
A/D8 A/D9 A/D10 A/D11 X X X X
0 1 2 3 4 5 6 7
BASE + 2 - A/D Channel, Digital Out & Status
Write control
MA0 MA1 MA2 X DOut0 DOut1 DOut2 X
0 1 2 3 4 5 6 7
Set the digital output bits as 0 for a TTL low and 1 for a TTL high. You must know
the current value of the digital outputs (the last value written) if you want to change
the A/D channel and maintain the digital output lines at their current status. There is
no read back for the digital outputs.
Table 5-1. A/D Channel Address Codes
Set A/D channel address via MA2 MA1 MA0
Channel 0 0 0 0
Channel 1 0 0 1
Channel 2 0 1 0
Channel 3 0 1 1
Channel 4 1 0 0
Channel 5 1 0 1
Channel 6 1 1 0
Channel 7 1 1 1
The digital outputs are latched, and will maintain the last value until overwritten or the
computer or PCM-DAS08 is reinitialized.
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