Ttl Input/Output Symbols - Prior Scientific ProScan III Manual

ProScan® III Manual
4.16 TTL input/output signals
The ProScan III controller has the capability of reading and sending signals to and from
other external equipment through its standard TTL port. This powerful capability allows
the controller to process data and make decisions based on other external sources with
TTL capability, such as pressure switches, line scan cameras, and relays. The ProScan
controller has a 10 way boxed header (male). Four pins are assigned to TTL output (one
Byte) from the controller and four pins to TTL inputs (one Byte). The matching female
part to be used with this header is an industry standard ribbon cable socket with centre
bump polarisation (to ensure correct orientation) manufactured by 3M (part number
3421-6620). The TTL outputs use a 74HCT374 buffer IC and the TTL inputs input to a
74HCT541 buffer. +5 Volts is available from pins 1 and 2 for TTL power to a limited
amount of circuitry. The maximum current is 100mA. 0V is the zero volts of the
electronics inside the controller, which is also chassis ground.
K2 Pin allocation
Pin number
1
2
3
4
5
6
7
8
9
10
Pin layout
9
10
© Prior Scientific Instruments Ltd
Signal
+5V_OUT
0v (Ground)
TTL_OUT 0
TTL_OUT 1
TTL_OUT 2
TTL_OUT 3
TTL_IN 0
TTL_IN 1
TTL_IN 2
TTL_IN 3
7 5 3
8 6 4
Version 1.12 June 2017
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