Heathkit H14 Manual page 9

Page 7
2.0 volts max.
2.0 rnA max.
20 rnA min.
Voltage drop (marking)
Spacing current
Marking current
Operating levels for current loop operation are:
Transmitter
~~--------------
To use the current loop, install jumper wires between
circuit board holes J113 and J114, and Jl10 and Jl11.
Current loop operation of data terminal equipment is
normally done in the passive mode. This requires the
installation of jumper wires between ]101 and J102.
and J105 and J106.
20 rnA Current Loop
•
The Schematic Diagram and previous cable lead iden-
tification chart indicate the polarity of current loop
signals for passive operation. For active operation,
the polarities of lhese signals are reversed. Remove
the passive loop jumper wires and then install jum-
pers between:
Receiver
Voltage drop (marking)
Spacing current
Marking current
2.7
volts max.
3.0 rnA
max.
15 rnA
min.
•
J101 and
1103\
Input
P02 and J104
J105 and
1107\
Output
Jl06 and J108
Proceed to the "Operation" section.
•