Measurement Computing CIO-DAS08-PGH - Manual (Page 23)

4.8 DIGITAL INPUT
The digital inputs are simple TTL level lines. They feed into an 8-bit register which has other on-board signals fed into it. The
resultant 8-bit status byte can be read at BASE address + 2.
The digital inputs IP1, IP2 & IP3 can be used as status lines to trigger or hold off A/D conversions. Be aware of possible conflicts
when pacing conversions from the on - board pacer and simultaneously using IP1 through IP3 as general purpose digital inputs.
4.9 DIGITAL OUTPUT
The digital output lines, OP1, OP2, OP3 & OP4 are TTL level lines which are controlled with part of an 8-bit register located at
BASE address + 2.
The lines are used to control the multiplexer address on an external CIO-EXP32 differential amplifier/ multiplexer if one is
installed. For that reason, we recommend not using them as general purpose digital outputs.
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