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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 120Ω

resistor across C and D

Figure 15b -

Termination for

EIA-232/EIA-485

Converter with pull-up

and pull-down resistors

+5V

GND

T+/R+

T-/R-

Com

1KΩ

120Ω

1KΩ

Converter box

termination

with pull-up

and pull-down

resistors.

ABCD

120Ω

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)

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 23 24

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