Measurement-computing CIO-DAS08-PGH User Manual download pdf (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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Measurement-computing CIO-DAS08-PGH User Manual Page 23