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Ttl output & trigger input configuration, Expanded memory configuration, Caution – Measurement Computing TempScan/1100 User Manual

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1-14 System Overview

899493

TempScan / MultiScan User's Manual

DB50 Digital I/O Pin Descriptions

Line

Pin

Line

Pin

Line

Pin

Line

Pin

Line

Pin

Output 1

1

Output 11

37

Output 21

24

Output 31

11

Ground

12

Output 2

34

Output 12

21

Output 22

8

Output 32

44

Ground

13

Output 3

18

Output 13

5

Output 23

41

Input 1

15

Ground

14

Output 4

2

Output 14

38

Output 24

25

Input 2

48

Ground

28

Output 5

35

Output 15

22

Output 25

9

Input 3

32

Ground

29

Output 6

19

Output 16

6

Output 26

42

Input 4

16

Ground

30

Output 7

3

Output 17

39

Output 27

26

Input 5

49

Ground

31

Output 8

36

Output 18

23

Output 28

10

Input 6

33

Ground

45

Output 9

20

Output 19

7

Output 29

43

Input 7

17

Ground

46

Output 10

4

Output 20

40

Output 30

27

Input 8

50

Ground

47


Each digital output line will drive five (5) standard TTL (transistor-transistor logic) loads. All digital input
lines are one-eighth (0.125) TTL loads. All inputs are protected against damage from high static voltage.
Normal precautions should be taken to limit the input voltages to the range of 0.0 to 5.3 volts. All digital
I/O lines are referenced to digital ground.

CAUTION

Do not exceed the levels described. Otherwise, the TempScan/1100 or

MultiScan/1200 unit may be damaged in a way that is not covered by the
warranty.

TTL Output & Trigger Input Configuration


The rear panel of the TempScan/1100 or MultiScan/1200 unit also provides two external BNC connectors:
The TTL output and the trigger input. The BNC TTL scan output is used for synchronizing equipment
with TempScan/1100 or MultiScan/1200 acquisition, while the BNC trigger input is used for starting
and/or stopping acquisition of the TTL output. This trigger input can be programmed to activate on a
rising (positive-going) or falling (negative-going) TTL level edge. Any TTL level signal
(> 2.2V = Hi, < 0.8V = Lo) may be used as a trigger pulse. A trigger pulse may also be used to generate a
Service Request. Note that the TTL Out is a LS-TTL compatible output, 0.4 mA sourcing, 8 mA sinking.
When a scan is logged into the acquisition buffer (after the actual scan), the TTL output signal is pulsed for
100 ms. Refer to the timing diagram.

This manual is related to the following products: