Keri Systems MR16in - Manual (Page 2)

Mercury Security Corporation © 2009 MR16in DOC 10107-0010 REV 2.01 Page 2
3. Communication Wiring:
The MR16in communicates to an intelligent controller (EP2500 for example) via a 2-wire RS-485
interface. The interface allows multi-drop communication on a single bus of up to 4,000 feet (1,200 m).
Shielded cable of 24AWG with characteristic impedance of 120 ohm is specified for the RS-485 interface.
The last devices on each end of the cable should have the terminator installed (set jumper J1 on).
Install the following jumpers for the RS-485 interface according to the selected configuration:
4. Alarm Inputs Wiring:
Inputs 1 to 16 may be configured to use or not use End Of Line (EOL) resistors and to use normally open
or normally closed contacts. Input CT and input BA are used for monitoring cabinet tamper and power
failure, respectively. These two inputs are for contact closure monitoring only, and do not use EOL
resistor(s).
Input configuration is set via host software.
TR+
TR-
R+
R-
GND
2W
4W
2-WIRE
TB10
(ONLY 2-WIRE RS-485 IS SUPPORTED)
NC
NO
NO
NC
1K,1%
1K,1%
1K,1%
1K,1%
TB6
TB
5
I9
I9
I10
I10
I11
I11
I12
I12