E-Mon EIDR-16J*RJ - Manual (Page 15)

INTERVAL DATA RECORDER (IDR)
15 62-0394-03
6.0 SERIAL COMMUNICATIONS (EZ7)
(CONTINUED)
Method 1: Modular Plug Method
This method requires using 4 stranded conductors inside a cable that is fitted with an
RJ-11 type plug for 4-conductor modular systems at each end of the cable.
* Do not use any pre-made telephone cables. See Appendix A for correct cable
configuration.
1. Plug the 4-wire RJ-11 cable/plug assembly into either PORT 1 or PORT 2 of the
IDR.
2. The unused RS-485 port is used to connect another cable to the next IDR. This
is called a “daisy-chain” connection. This can be done repeatedly to connect as
many as 52 individual IDRs. NOTE: The total combined cable length must be no
more than 4,000 feet.
3. Each IDR has two LEDs (yellow and green) located directly below the RS-485
jacks. If the system is properly wired, these two LEDs will normally be OFF.
These LEDs will flash when the computer and IDR are communicating.
Method 2: Terminal Block Method
IDRs may also be daisy-chained using a 3-conductor cable. Instead of using the
two modular jacks for the RS-485 daisy chain, you can use Port 1, between the
RJ11 jacks.
1. Daisy-chain the IDRs by connecting:
- All HI terminals together
- All LO terminals together
** This requires putting two wires into each of the 2 terminals.