Mercury Security © 2013 MUX8 DOC 10107-0016 REV 2.01 Page 3
Jumper settings:
PORT 2 IS RECEIVE ONLY FOR 4-WIRE RS-485
PORT 4 IS RECEIVE ONLY FOR 4-WIRE RS-485
PORT 6 IS RECEIVE ONLY FOR 4-WIRE RS-485
PORT 8 IS RECEIVE ONLY FOR 4-WIRE RS-485
PORT 1 RS-485 TERMINATION –DO NOT USE
PORT 2 RS-485 TERMINATION
PORT 3 RS-485 TERMINATION
PORT 4 RS-485 TERMINATION
PORT 5 RS-485 TERMINATION
PORT 6 RS-485 TERMINATION
PORT 7 RS-485 TERMINATION
PORT 8 RS-485 TERMINATION
PORT 9 RS-485 TERMINATION
Table 2-2
IMPORTANT NOTE Install the termination jumper ONLY on the panel at each end of the RS-485 bus.
Failure to do so will compromise the proper operation of the communication channel. Port 1: It is
recommended that the termination jumper (J2) not be installed and remove all other termination
jumpers on the units connected to this communication bus.
4. Specifications:
The multiplexer is for use in low voltage, class 2 circuits only.
Primary power:
DC input: 12 to 24 Vdc ± 10 %, 200 mA maximum
Interfaces:
Port 1: RS-232/RS-485, selectable
Port 3,5,7,9 RS-485, Transmit/Receive
Port 2,4,6,8 RS-485, Transmit/Receive, or Receive Only
Wire requirement:
Power: 1 twisted pair, 18 AWG
RS-485: 24 AWG, 4,000 feet (1,200 m) maximum, twisted pair(s) with shield.
RS-232: 24 AWG, 50 feet (15 m) maximum
Environmental:
Temperature: 0 to 70 °C, operating
-55 to +85 °C, storage
Humidity: 0 to 95 % RHNC
Mechanical:
Dimension: 5 in. (127 mm) L x 6 in. (15 2mm) W x 1 in. (25 mm) H
Weight: 4 oz (180 g) nominal
