Watlow MICRODIN - Manual (Page 15)

15
Watlow MicroDIN Quick Start Guide
Special EIA-485 Network Considerations
If your MicroDIN network doesn't work, it may need termination and pull-up
and pull-down resistors; wire them per the diagrams below.
Figure 15 a- Termination
for MicroDIN; RJ-11
phone plug with 120
Ω
resistor across C and D
Figure 15b -
Termination for
EIA-232/EIA-485
Converter with pull-up
and pull-down resistors
+5V
B
A
GND
T+/R+
T-/R-
Com
1K
Ω
120
Ω
1K
Ω
Converter box
termination
with pull-up
and pull-down
resistors.
A B C D
120 Ω
Plug terminator into open socket in MicroDIN controller furthest from computer,
the last unit on the network.
RJ-11 Terminals
C (green) and D (yellow)