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7847i-E Installation and Setup Guide
Encryption
The 7847i-E and receiver support private key encryption. Private key encryption means that
both the sender and the receiver know the KEY used to encrypt the data. Each device
produced by Honeywell is loaded with a globally unique identifier called a MAC number, and
a large random number or KEY.
number in the clear followed by the message that is encrypted using the KEY data.
The communication devices use 256 bit AES (Rijndael) encryption (which is required for
certain government installations). The AlarmNet-i AES Encryption Software Module
Version 1.0 contained in the Honeywell products has NIST approval. Listings for this
approval can be found at http://csrc.nist.gov/groups/STM/cavp/documents/aes/aesval.html
Certification number 979.
Installation Key
At installation a 10-digit installation key needs to be programmed into every device in the
network. This 10-digit key should be the same for all devices used in the Private LAN mode.
The communication device uses this key to encrypt its private key when it registers with the
receiver. This way its MAC and private key can be learned. This installation key is used for
registration purposes only and is not used for supervision or alarm transmission. Once a
device is registered the receiver will have a copy of the 7847i-E's factory KEY. From this
point on the unique factory key is used for communications.
Recovery Mode
In the event of a failure of the receiver requiring the replacement of the hardware or the
erasure of its memory, the receiver supports a Recovery Mode. In Recovery Mode, the
receiver is programmed with the same 10-digit installation key. When a 7847i-E
communicates with the receiver and is found not to exist in its database, a special response is
sent back to the 7847i-E requesting it to re-register itself. The 7847i-E then registers using
the 10-digit installation key. When all accounts have been recovered, Recovery Mode can be
turned off to provide better control of registration.
Modes of Operation
UL/ULC
The 7847i-E provide four modes of operation so they can be used with various types of control
panels, as summarized below:
ECP Mode
•
This mode is for use with Honeywell controls that support communication device (LRR)-ECP
communication
•
The module connects to the control's keypad terminals and provides 2-way communication
with the control using ECP messaging
•
The control treats the module as a communication (LRR) device, so program the control
accordingly, including setting the module's proper device address
•
Panel-generated reports are sent in Contact ID format
•
The module also supports two hardwire zone trigger inputs (zones 6 and 7) – these report in
ADEMCO High-Speed format
1-2
When a device contacts the receiver it sends the MAC
Only ECP Mode has been approved for ULC installations.
ECP and Zone Trigger have been approved for UL installations
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