![GLI P63 Скачать руководство пользователя страница 34](http://html.mh-extra.com/html/gli/p63/p63_operating-instructions-manual_2231741034.webp)
PART TWO - INSTALLATION
SECTION 3 - ELECTRICAL CONNECTIONS
Rev. 7-1201
Model P63 pH Analyzer
33
DC Relay Coil
Driver Operation
☞
Since the TTL outputs are open collector outputs, they may
be used to switch current through a device such as a DC
relay coil. Refer to Figure 2-13 for the wiring arrangement to
use TTL Output A as a DC relay coil driver. This connection
requires an external voltage supply and an appropriate di-
ode.
The following connection is for TTL Output A. Connect
the other TTL outputs in the same way using their re-
spective terminals.
NOTE:
Each TTL output can sink a maximum of 20 mA.
1. Connect one side of the relay coil to TB3 “TTL Outputs
A” terminal 3.
2. Connect the other side of the relay coil to an external
positive voltage supply (+V
ext
).
3. Connect a diode (1N4002 type), anode side towards
TB3 terminal 3, across the relay coil.
4. Connect TB3 “COM” terminal 2 to an external ground.
FIGURE 2-13
TTL Output Connections for
DC Relay Coil Driver Operation
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com