Honeywell E-Mon IDR Series Installation Instructions Manual page 11

6.0 SERIAL COMMUNICATIONS (EZ7)
1. Hardwired System using the USB Communication Key. (See the hardwired system configuration diagrams
in Appendix F.)
The USB communications key allows you to connect IDRs to a personal computer that has Honeywell
E-Mon Energy Software installed. The computer communicates with the IDRs through the USB key.
The USB key must be located within 15 feet of the host computer.
2. Connecting the USB key to the computer.
The USB key is supplied with:
a. (1) 3 FT USB A to USB B cable
b. (1) 7 FT 4 conductor modular cable with RJ11 4 pin plug
Connect the supplied USB A to USB B cable to the USB Key. Plug the opposite end of the cable into any
USB Port of a personal computer or laptop. Using the CD included with the USB Key, Install (2) drivers to
the PC or laptop.
3. Connecting IDRs to the USB Key using the 7 FT modular cable provided with the USB Key.
As many as 52 IDRs can be connected to the USB Key over a total cable length of 4000 feet.
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.
a. Plug the 4-wire RJ-11 cable/plug assembly into either PORT 1 or PORT 2 of the IDR.
b. 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.
c. 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.
a. 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.
4. RS-232 Key with Built-In Modem (USBK)
The RS-232 key with built-in modem connects the entire RS-485 network of IDRs to a telephone line.
** Refer to the previous section, "Connecting IDRs to the RS-232 key using RS-485." Connect the RS-485
network via Method 1 or Method 2.
On the back panel of the RS-232 Key/modem, the left jack (RS232) is not used in most cases since there is
no local host computer.
The two jacks at the top center of the rear panel on the RS-232 key/modem are for connecting to the
phone line. Connect one of these two jacks to the telephone line.
IMPORTANT:
The telephone line should be dedicated exclusively to the automatic meter reading system. Never con-
nect to a phone line that has other modems or fax machines connected. If there are telephones con-
nected to this phone line, the proprietor must be aware that all phones must be on "hook" in order for the
modem to work. A dedicated telephone line is recommended for system reliability.
5. Baud Rate
The communication baud rate is 9600 baud (factory default).
When using the IDR with a modem, the rate of 9600 should always be selected.
E-MON INTERVAL DATA RECORDER
11 62-0394—06