Cloud Electronics CDR-1B - Manual (Page 7)

CDR‑1 & CDR‑1F Installation Guide v2.0 7
Diag. (a) shows four CDRs, each connected to one DCM-1/e port; (b) shows a single
daisy-chain of two CDRs all on one port; c) shows two daisy-chains each of two CDRs
using two ports. Note that in the diagrams there is deliberately no indication as to
which zones any of the CDRs are in; this is because the system imposes no restriction
on their physical location. CDRs in different zones may be in the same “chain”, and
interconnections may be made purely on the basis of wiring convenience.
The CAT-5 wiring is essentially a data network, and as such, must be correctly
terminated. Both the DCM-1/e and CDR are provided with means of setting their
network terminations ON or OFF.
The rule governing terminations is:
•
Devices (DCM-1/e or CDR) at the ends of a cable run must have their terminations
set ON.
•
All intermediate devices must have their terminations set OFF.
•
If both connectors on the same DCM-1/e CDR-1 PORT (either PORT A or
PORT B) are being used, the DCM-1/e may be considered as an intermediate
device, and its termination should be set to OFF*.
The correct termination setting is indicated for each device in the three wiring examples
illustrated on page 6. See Step 5 of “
Connecting and Mounting – CDR-1” on page
page 11, or Step 3 of “ Connecting and Mounting – CDR-1F” on page 14 for details
of how to set it.
*Please refer to the DCM-1/e Installation and User Guide, Section 4 (Appendix), for details of how
to set/unset the DCM-1/e’s CDR-1 PORT network terminations.