CPC400 Series User’s Guide Chapter 2: Installation
Doc. 0600-2900-2000 Watlow Anafaze 45
Signal Common
For usual installations, do not connect the dc commons of
the controllers together or to the converter or host device.
Termination
For EIA/TIA-485 signals to be transmitted properly, each
pair must be properly terminated. The value of the termi-
nation resistor should be equal to the impedance of the
communications cable used. Values are typically 150 to
200 Ω.
The receive lines at the converter or host device should be
terminated in the converter, the connector to the host de-
vice or the device itself. Typically the converter documenta-
tion provides instructions for termination.
Use a terminating resistor on the receive lines on the last
controller on the 485 line. Set jumper JU1 in position B to
connect a 200 Ω resistor across the receive lines. See
Changing the Hardware Communications Protocol on page
157.
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