Watlow MICRODIN - Manual (Page 29)

Wa t l o w M i c r o D I N 3 . 9
Install and Wire
Special EIA-485 Network Considerations
If your MicroDIN network needs termination and pull-up and pull-down
resistors, wire them per the diagrams below. See
Chapter 2 , “Communications
Setup.”
Figure 3.9 a- Termination
for MicroDIN; RJ-11
phone plug with 120
Ω
resistor across C and D
Figure 3.9b -
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.
RJ-11 Terminals
C (green) and D (yellow)
A B C D
120 Ω
Plug terminator into open socket in MicroDIN controller furthest from
computer, the last unit on the network.