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Remote Switch Installation
The serial port consists of multiple 2-wire inputs on
the terminal block. There are two 2-wire inputs on the
1 and 2 circuit models and eight 2-wire inputs on the
larger models. You can use a standard SPST wall switch
to make this connection. Install wiring for serial port
applications by inserting wiring into the available slot,
then securing with a flathead screwdriver.
CAN Bus
CAN (controller area network) devices provide advanced
remote switch capabilities over a longer range.
1 and 2 circuit system: Connect devices through a four-
wire interface on the terminal block above the deadfront.
4, 8, 12, 16 circuit system: Connect devices on the rear
of the interface PCB. Devices can be wired daisy-chain or
star. When the line is required to be "terminated," connect
the TRM terminal to the C_H terminal with an external
jumper. Route the cable through one of the knockouts at
the bottom center of the enclosure.
CAN Bus Terminal Block
1 +5V
2 C_H
3 C_L
4 TRM (120 ohm termination)
5 GND
• Maximum bus length: 1,000 Meters (3280 Feet)
• Maximum number of remote devices: 16
• Wire type: 1 pair twisted with shield – UL Type CL2
• Wire gauge range: 16 to 26 AWG
ET9XX15
CAN BUS
CONTROLLER
DEVICE #1
C_H
C_L
TRM
GND
C_H
C_L
TRM
SHIELD
1 PAIR TWISTED WITH SHIELD
UL TYPE CL2
MAX LENGTH = 1000 METERS
(3280 FEET)
Figure 3: Example showing daisy-chain connections'
end units with termination
CAN BUS
DEVICE #2
GND
C_H
C_H
C_L
C_L
TRM
TRM
GND
GND
SHIELD
SHIELD
DOOR ASSEMBLY REMOVAL AND
INSTALLATION – 4 TO 16 CIRCUIT MODELS
CAUTION
Power to the ET90000 System must be OFF before adding or
removing any system components. Failure to remove power
could result in personal injury, damage to the equipment, and
voiding of the product warranty.
Removal
1.
Open outer door; remove and retain the two screws
that secure the interior deadfront to the chassis.
2.
Remove and retain the screw that secures the
controller door assembly and open the door.
3.
Disconnect the following cables from the controller
and interface boards and label each connector/wire
with its location.
• Cable between controller and interface
• Ethernet cable
• Channel 1-4, 5-8, 9-12, 13-16
• CAN bus connections
• Remote switch connections
Note: Some connectors have a latching feature; press to
remove.
4.
Close the door; remove and retain the top hinge
screw located at the top of the assembly.
5.
Lift up the assembly until it clears the hinge support,
then lift the assembly towards the top of the
enclosure until it is free of the bottom hinge support.
8
ET90000 Series Electronic Timer
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