Black Box IC476A-F-R2 - Manual (Page 20)

19
CHAPTER 4: Installation
4.2 Connection to the RS-232 Interface
Once you have properly configured the Converter and connected the
twisted-pair wires correctly, simply plug the Converter directly into the
DB25 port of the RS-232 device. After doing so, remember to insert and
tighten the two captive connector screws.
NOTE
If you must use a cable to connect the Converter to the RS-232 device,
make sure it is a straight-through cable of the shortest possible length.
We recommend no more than 6 ft. (1.8 m).
4.3 Wiring for Multipoint Applications
The Converter supports multipoint applications using daisychain topology.
Using a daisychain topology, you may connect several Converters together
in a master/slave arrangement. Maximum distance between the units will
vary based upon the number of drops, data rate, wire gauge, etc.
The illustration below shows how to wire the two-pair (4-wire) cables
properly for a daisychain topology. Note that the ground connection is not
needed.
NOTE
Connections are to screw terminals directly on the Converter.
XMT A
XMT B
RCV B
RCV A
XMT A XMT A
RCV B RCV B RCV B RCV B RCV A RCV A RCV A RCV A
XMT A XMT A XMT B XMT B XMT B XMT B
MASTER SLAVE 1 SLAVE 2 SLAVE 3 SLAVE N