3.1.5 /oRESET Control Line
The /oRESET control line is an active low signal that follows the internal reset line of
the Digital488HS/32. During power-on or external application of a low input to the
/iRESET line, this line remains in the low state for approximately 120 to 150 ms.
There is no selection for polarity for this control line.
3.1.6 Logic Supply Lines
The +5 V connection provides five volts for use by external circuits. Care must be
taken to assure that the external circuit does not draw more than 100mA.
3.1.7 Data Transfer Speed Considerations
The data transfer speeds on the IEEE 488 bus are affected by both the IEEE 488 bus
talker and the IEEE 488 bus listener. In fact, the data on the bus can only transfer as
fast as the slowest listener. The Digital488HS/32 is capable of accepting bus data for
transfer to the output port at greater than 1,000,000 bytes per second. The data
acceptance time (time between falling edge of DAV to rising edge of NDAC) is
approximately 200 ns. This allows the IEEE talker 800 ns on its part of the handshake
to meet the 1,000,000 bytes per second transfer speed.
3.2 Digital Input Port
The digital input port contains 16 bits of TTL level inputs, one END line (iEND)
input, two handshake lines (iDAV and iBusy), one control line (/iRESET), two status
lines (SB1 and SB2) and logic supply lines (+5V and ground).
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