CLASS 320 METER
25 62-0397-02
6.8.2 Connecting the RS-232 Key to the Computer (continued)
3. Connect the provided AC adapter into the rear panel input on the RS- 232 key.
Plug the adapter into a 120VAC outlet. On the front panel of the RS-232 key, two
LEDs (POWER ON and AC ON) will light up.
NOTE: When the Honeywell Energy™ software is accessed on the computer, a third
LED (RS232 READY) will turn on. This indicator will light up as soon as the
Honeywell Energy software is booted up and the correct COM port is set up
via the settings provided in the software’s Locations menu.
6.8.3 Connecting Class 320 Meters to the RS-232 Key using RS-
485
On the rear panel of the RS-232 key, there are three jacks labeled as channels A, B
and C. These are RS-485 serial communications ports used to connect the meters.
Each of these channels can be connected to as many as 52 individual meters over a
total cable distance of 4,000 feet. The channels are independent and must not be
connected to each other.
Modular Plug Method
This simple method requires using 4 stranded conductors inside a cable that is fitted
with an RJ-11 type plug for 4-conductor modular systems at the key end of the cable
and open conductors on the meter end.
*Do not use any pre-made telephone cables.
1. Plug the 4-wire RJ-11 cable/plug assembly into Channel A on the RS-232 key.
Connect the other end of this cable to the meter via the RS-485 port at the bot-
tom right of the Class 320 meter main power board.
NOTE: The total combined cable length must not be more than 4000 feet.
2. Each meter has one yellow (TX) and one green (RX) LED located on the right
side of meter board just below the ribbon cable. If the system is properly wired,
these two LEDs will be OFF. These LEDs will flash when the computer and
meter are communicating.
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