The four pieces of BNC connectors are the digital inputs of the TTL Input Control Module. They have identifier letters A to D instead of numbers. The reason is that the digital input/output lines of the system bus are numbered. This way they cannot be mixed up during the assignment process of the input/output lines of the 12-bit USB System Controller to the channels of the TTL Input Control Module.
Inputs: TTL / 3.3 V compatible, 0.5 unit-loads
The TTL standard describes the voltage and load specifications of the inputs and outputs of a digital logic system, what is supplied from 5V. Nowadays most of the microcontrollers and digital systems use 3.3V of supply voltage internally. The inputs of the TTL Input Control Module are universal. They are fully compatible with the standard TTL specification. Furthermore they accept the logic levels of the non-standard-TTL 3.3V systems correctly, with optimal noise margins, too.
The four pieces of BNC connectors are the digital inputs of the TTL Input Control Module. They have identifier letters A to D instead of numbers. The reason is that the digital input/output lines of the system bus are numbered. This way they cannot be mixed up during the assignment process of the input/output lines of the 12-bit USB System Controller to the channels of the TTL Input Control Module.
Inputs: TTL / 3.3 V compatible, 0.5 unit-loads
The TTL standard describes the voltage and load specifications of the inputs and outputs of a digital logic system, what is supplied from 5V. Nowadays most of the microcontrollers and digital systems use 3.3V of supply voltage internally. The inputs of the TTL Input Control Module are universal. They are fully compatible with the standard TTL specification. Furthermore they accept the logic levels of the non-standard-TTL 3.3V systems correctly, with optimal noise margins, too.
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