Page: 30
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4 Operation
4 Operation
Librae instruction manual >
Page: 31
4.8 Connections
4.8.1 Communication port connection
Librae Incapacitance Tester is provided with a D-sub (DA-15 Female) TTL I/O port (see Figure
3.8.2). This port can be used to synchronize some events with external instruments or
acquisition systems. TTL Output signal are electrically isolated to provide an electrical barrier
between Librae Incapacitance Tester and any other external device.
TTL signals are refered to Power Ground (pimn 14 and pin 15)
Refers to Figure 4.8.1.1 and Table 4.8.1.1 for connector pinout
Figure 4.8.1.1
DB-15 Pin#
Signal Name
Signal Type
Description
1
Start/Stop
TTL OUT
Start -> TTL High Level
Stop -> TTL Low Level
2
Manual/Autostart
TTL OUT
Manual -> TTL High Level
Autostart -> TTL Low Level
3
Reserved
TTL OUT
Reserved
4
Reserved
TTL OUT
Reserved
5
Reserved
TTL OUT
Reserved
6
Reserved
TTL OUT
Reserved
7
Reserved
TTL OUT
Reserved
8
Reserved
ANALOG OUT
Reserved
9
Reserved
TTL IN
Reserved
10
Reserved
TTL IN
Reserved
11
Reserved
TTL IN
Reserved
12
Reserved
TTL OUT
Reserved
13
Reserved
TTL OUT
Reserved
14
GND
POWER
Power Ground
15
GND
POWER
Power Ground
Table 4.8.1.1
NOTE: TTL OUT is designed for connection with scientific instruments! DO NOT CONNECT ANY
POWER DEVICE!
NOTE: DO NOT SINK a current more than 10mA from each TTL pin. DAMAGE WILL OCCUR
