50 TX3 Telephone Access System Installation and Operation Manual Version 5.4
LT-969 Copyright 2019
Lobby Control Unit Setup
4.1.1 Connectors
USB. Computer connection for firmware download and configuration.
P4. Modem Module connector.
P5. IP Module connector.
P6. Key pad and front door LCD display.
P7. Guard Phone Board connector.
4.1.2 Potentiometer
PT1 (if present). Pulse phone potentiometer. This potentiometer is normally
factory set and does not require adjustment.
4.1.3 Switches
SW1. SW1 sets the unit’s RS-485 ID (node address) and the IP addressing mode.
SW2. SW2 turns the unit’s power ON and OFF for servicing, or to re-start the
unit.
4.1.4 Jumpers
JW1. JW1 is used for updating firmware and is normally open.
JW2. JW2 is used for updating firmware and is normally open.
JW3. JW3 is not used and is left open.
JW4. JW4 is not used and is left open.
JW5. If end-of-line 120 Ω resistors for RS-485 are not available, close JW5 on
the first and last controller connected by RS-485. By default this jumper is open.
JW6 (if present). JW6 is not used and is left open.
JW7. JW7 is on for a Touch Screen unit, and off otherwise.
JW8. JW8 defines the operating state of the door strike relay as normally open or
normally closed. A jumper wire connects to either the normally open (position 2
- top) or normally closed pin (position 1 - bottom). The default setting is normally
open (position 2 - top).
JW9 and JW10. If there are problems with RS-485 communication, close both
JW9 and JW10 on either the first or last controller connected by RS-485. By
default these jumpers are open.
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