Contemporary Control Systems PCI20U Adapters - Manual (Page 10)

TD030700-0I
G
10
-4000 AC-Coupled EIA-485 (backplane mode)
The -4000 transceiver is used when backplane mode operation is desired. It is
similar to the -485X transceiver in operation but has some subtle differences.
A maximum of 8 NIMs may be connected on a single bus segment with up to
262 feet of twisted-pair cable.
Termination can be accomplished by installing
a TB5-TER, RJ-45 terminator in the unused RJ-45 jack.
E1
E1
For 485X only
For 485D only
Figure 7 — Jumper settings for EIA-485 models.
Electromagnetic Compatibility
The PCI20U series complies with Class A radiated and conducted emissions
as defined by C
FR 47 Part 15 and EN55022. This equipment is intended for
use in non-residential areas.
Warning
This is a Class A product as defined in EN55022. In a domestic
environment this product may cause radio interference in which case
the user may be required to take adequate measures.
-4
85 DC-Coupled EIA-485 (backplane mode)
The -485 transceiver is used when backplane mode operation is desired. All
operating parameters are the same as the -485D transceiver except that the
COM20022 is set for backplame mode operation. Refer to the -485D section
for operating details.