Mircom TX3 Series Installation Manual page 94

3.15 RS-485
An RS-485 terminal lets you easily connect multiple lobby, card access and
elevator restriction controllers across a network. The RS-485 connection is
situated at the bottom middle of the main controller board and consists of two
separate terminals, each for an input and output. See figure 81.
Connect the RS-485 input terminal to the RS-485 output terminal of another
controller. See figure 81.
If you do not have end-of-line 120 Ω resistors, close JW5 on the first and last
controllers instead. See LT-969 TX3 Telephone Access System Installation and
Operation Manual on www.mircom.com.
If there are problems with RS-485 communication, close both JW9 and JW10 on
either the first or last controller connected by RS-485. See LT-969 TX3
Telephone Access System Installation and Operation Manual on
www.mircom.com.
Note:
Recommended cables:
•
•
Maximum total length:
•
•
94 TX3 Touch Screen Installation Manual
Use twisted shielded pair.
RS485 cables
• Belden 3109A RS-485, (4 pr) 22 AWG (7x30) or equivalent
• Belden 9842 RS-485, (2 pr) 24 AWG (7x32) or equivalent
• Belden 9841 RS-485, (1 pr) 24 AWG (7x32) or equivalent
CAT5 Cables
• Belden 72001E ETHERNET Cat 5e 2 Pair, 24 AWG or equivalent
• Belden 70006E Cat 5e, 100Mb/s, Quad, AWG 22 (1) or equivalent
4000 feet (1244 m) for 22 AWG
2500 feet (762.5 m) for 24 AWG
Touch Screen System and Setup