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PART TWO - INSTALLATION
SECTION 3 - ELECTRICAL CONNECTIONS
Model P63 pH Analyzer
Rev. 7-1201
32
External-supply
Logic Operation
☞
Refer to Figure 2-12 for the wiring arrangement to use TTL
Output A for logic signal operation from an external power
supply. This connection requires an external voltage supply
and a “pullup resistor.”
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 the external device’s low reference to TB3
“COM” terminal 2.
2. Connect the external device’s input to TB3 “TTL Out-
puts A” terminal 3.
3. Connect an appropriate “pullup” resistor from the exter-
nal device’s input to the external device’s positive
voltage supply (24 VDC maximum).
FIGURE 2-12
TTL Output Connections for
External-supply Logic Operation
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