TTL Inputs (GP In 5, 6, 7, 8)
Relay Inputs Pin-Out
The relay must be connected between the ground and the corresponding TTL input on the
DB-25.
TTL Inputs Pin-Out
Each TTL input on the DB-25 is directly connected to the pin of the TTL connector on the
device triggering the GPI. The ground must be common between the DB-25 connector of
the XT3 server and the external device.
Specifications
•
each pin can be individually configured as an output or an input
•
internal 4K7 pull up to +5 V
•
low level Vi < 1.5 Volt (U12 = 74HC245)
•
high level Vi > 3.5 Volt (U12 = 74HC245)
•
optional TTL compatible level (U12 = 74HCT245)
HARDWARE TECHNICAL REFERENCE MANUAL XT3 Server 12.05
5. Hardware Installation and Cabling
81
Содержание XT-3
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