Carrier UC Open XP Installation manual

U
UC C O Op pe en n X XP P a an nd d
U
UC C O Op pe en n X XP P I IO O
I
In ns st ta al ll la at ti io on n a an nd d S St ta ar rt t- -u up p G Gu ui id de e
CARRIER CORPORATION ©2017
A member of the United Technologies Corporation family · Stock symbol UTX · Catalog No. 11-808-437-01 · 2/24/2017

Verify that you have the most current version of this document from
www.hvacpartners.com
or your local Carrier
office.
Important changes are listed in
Document revision history
at the end of this document.
CARRIER CORPORATION ©2017. All rights reserved throughout the world. i-Vu is a registered trademark of Carrier
Corporation. All other trademarks are the property of their respective owners.

Contents
Introduction.................................................................................................................................................................. 1
What are the UC Open XP and UC Open XP IO?...............................................................................................1
UC Open XP specifications ..................................................................................................................................2
UC Open XP IO specifications .............................................................................................................................4
Safety considerations...........................................................................................................................................5
Installing the UC Open XP ........................................................................................................................................... 6
Mounting the UC Open XP ...................................................................................................................................6
Wiring the UC Open XP for power.......................................................................................................................6
To wire for power................................................................................................................................... 7
Addressing the UC Open XP ................................................................................................................................7
Wiring for communications.................................................................................................................................7
Wiring specifications for BACnet MS/TP and ARC156........................................................................ 8
To wire the controller to the network ................................................................................................... 8
Wiring inputs and outputs ...................................................................................................................................9
Input wiring specifications .................................................................................................................... 9
Inputs ..................................................................................................................................................... 9
Binary outputs .....................................................................................................................................10
Analog outputs ....................................................................................................................................10
To wire inputs and outputs on the UC Open XP.................................................................................11
Installing the UC Open XP IO expander....................................................................................................................14
To mount and attach the UC Open XP IO....................................................................................................... 14
To wire for power ............................................................................................................................................... 15
Wiring inputs and outputs ................................................................................................................................ 15
Input wiring specifications ..................................................................................................................16
Inputs on the UC Open XP IO ..............................................................................................................16
Binary outputs .....................................................................................................................................16
To wire inputs and outputs on UC Open XP IO...................................................................................17
Wiring devices to the UC Open XP's Rnet port.............................................................................................. 18
Rnet wiring specifications...................................................................................................................19
ZS sensor overview .............................................................................................................................20
SPT sensor overview ...........................................................................................................................20
To wire the ZS or SPT sensor to the UC Open XP ..............................................................................21
Wireless sensor overview ...................................................................................................................21
To install the Wireless Adapter for wireless sensors.........................................................................22
To wire an Equipment Touch to the UC Open XP...............................................................................23
Installing the UC Open XP into an i-Vu® Control System .......................................................................................25
Local access to the UC Open XP...............................................................................................................................27
Troubleshooting .........................................................................................................................................................28
UC Open XP LED's.............................................................................................................................................. 28
Expander LED's .................................................................................................................................................. 29
To get the serial number .................................................................................................................................. 30
To restore defaults............................................................................................................................................. 30
To replace the UC Open XP's battery.............................................................................................................. 31
Compliance ................................................................................................................................................................32
FCC Compliance................................................................................................................................................. 32
CE Compliance ................................................................................................................................................... 32
BACnet Compliance........................................................................................................................................... 32
Appendix A: UC Open XP and UC Open XP IO wire lists..........................................................................................33
UC Open XP wire list .......................................................................................................................................... 33
UC Open XP IO wire list ..................................................................................................................................... 35

Contents
Appendix B: AHU VAV input and output points list..................................................................................................37
AHU VAV inputs and outputs on the UC Open XP ......................................................................................... 37
AHU VAV inputs and outputs on the UC Open XP IO .................................................................................... 38
Appendix C: AHU CV Open input and output points list..........................................................................................40
AHU CV Open inputs and outputs on the UC Open XP ................................................................................. 40
AHU CV Open inputs and outputs on the UC Open XP IO ............................................................................ 41
Document revision history ........................................................................................................................................43

UC Open XP and
UC Open XP IO Carrier Proprietary and Confidential CARRIER CORPORATION ©2017
Installation and Start-up Guide 1 All rights reserved
What are the UC Open XP and UC Open XP IO?
The Universal Controller Open XP (OPN-UCXP) is a general purpose controller. It provides the communications
circuitry, non-volatile memory, and removable screw terminals for I/O connections.
The Universal Controller Open XP IO (OPN-UCXPIO) is an expander that connects to the expandable UC Open XP, in
order to increase the number of inputs and outputs.
Introduction

Introduction
UC Open XP and
UC Open XP IO Carrier Proprietary and Confidential CARRIER CORPORATION ©2017
Installation and Start-up Guide 2 All rights reserved
UC Open XP specifications
Driver drv_ucxpopen_std_x-xxx-xxx
Maximum number of
control programs*
20
Maximum number of
BACnet objects*
1050
Maximum number of third-
party integration points
using Snap*†
10
* Depends on available memory
† BACnet third-party integration points are not counted.
Power 24 Vac ±10%, 50–60 Hz
20 VA power consumption
26 Vdc (25 V min, 30 V max)
Single Class 2 source only, 100 VA or less
BACnet MS/TP Port For communication with the controller network using MS/TP (9600 bps, 19.2 kbps,
38.4 kbps, or 76.8 kbps)
BACnet ARC156 Port For communication with the controller network using ARC156
Rnet port Supports:
•Up to 15 ZS sensors (5 per control program)
•One Wireless Adapter that communicates with up to 15 Wireless sensors
•One Equipment Touch
•Up to 4 SPT Standard sensors and one SPT Plus, SPT Pro, or SPT Pro-F sensor
NOTE
ZS sensors, a Wireless Adapter, and an Equipment Touch can share the
Rnet, but not SPT sensors.
Local Access port For system start-up and troubleshooting using Field Assistant or an Equipment
Touch device
Xnet Remote Expansion
port
For communication with the UC Open XP IO expander.
Inputs 12 inputs configurable for 0-10 V, RTD Therm Dry, or 0-20mA. Inputs 1 and 2 may
be used for pulse counting.
Input pulse frequency 10 pulses per second. Minimum pulse width (on or off time) required for each
pulse is 50 msec.
Input resolution 12 bit A/D
Aux Power Output 5 Vdc or 24 Vdc input sensor power. Jumper selectable, limited to 200 mA.
Available on input terminal 1.
Binary outputs 6 binary outputs, configured as dry contact, normally open or normally closed,
must be powered from a Class 2 power source.

Introduction
UC Open XP and
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Installation and Start-up Guide 3 All rights reserved
Analog outputs 6 analog outputs:
•1 and 2 are configurable for 0-10 V or 0-20 mA
•3 - 6 are 0-10 V only
Output resolution 8 bit D/A
Real time clock Battery-backed real time clock keeps track of time in the event of a power failure
Battery 10-year Lithium CR2032 battery retains the following data for a maximum of
10,000 hours during power outages: control programs, editable properties,
schedules, and trends.
Protection Incoming power and network connections are protected by non-replaceable
internal solid-state polyswitches that reset themselves when the condition that
causes a fault returns to normal.
The power, network, input, and output connections are also protected against
transient excess voltage/surge events lasting no more than 10 msec.
Status indicators LED's indicate status of communications, running, errors, and power. LED
indicators for transmit/receive for the BACnet MS/TP and ARC156 ports and for
each of the 12 outputs.
Environmental operating
range
0 to 140° F (-18 to 60°C), 0 to 90% relative humidity, non-condensing
Storage temperature range -24 to 140°F (-30 to 60°C), 0 to 90% relative humidity, non-condensing
Physical Rugged aluminum housing with removable screw terminals
Overall dimensions A:
B:
11-13/16 in. (30 cm)
5 in. (12.7 cm)
Mounting dimensions C:
D:
E:
4 in. (10.2 cm)
1/2 in. (1.3 cm)
13/64 in. (.5 cm)
Panel depth 2 in. (5.1 cm)
Weight 1.1lb. (0.5 kg)

Introduction
UC Open XP and
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Installation and Start-up Guide 4 All rights reserved
BACnet support Conforms to the BACnet Advanced Application Controller (B-AAC) Standard Device
Profile as defined in ANSI/ASHRAE Standard 135-2012 (BACnet) Annex L, Protocol
Revision 9
Listed by UL-916, (Canadian Std C22.2 No. 205-M1983), CE, FCC Part 15-Subpart B-Class A
UC Open XP IO specifications
Power 24 Vac ±10%, 50–60 Hz
13 VA power consumption
26 Vdc (25 V min, 30 V max)
Single Class 2 source only, 100 VA or less
Binary inputs BI 1 - 8 are binary only and support pulse counting up to 10 Hertz, dry contact
only.
Universal inputs UI 9 - 16 inputs are jumper selectable between thermistor/dry contact and 0-5
Vdc.
Input resolution 10 bit A/D
Input pulse frequency 10 pulses per second. Minimum pulse width (on or off time) required for each
pulse is 50 msec.
Binary outputs 8 binary outputs, configured as dry contact, normally open, and must be powered
from a Class 2 power source.
Protection Incoming power and network connections are protected by non-replaceable
internal solid-state polyswitches that reset themselves when the condition that
causes a fault returns to normal.
The power, network, input, and output connections are also protected against
transient excess voltage/surge events lasting no more than 10 msec.
Status indicators LED's indicate status of communications, running, errors, and outputs
Environmental operating
range
0 to 140° F (-18 to 60°C), 0 to 90% relative humidity, non-condensing
Storage temperature range -24 to 140°F (-30 to 60°C), 0 to 90% relative humidity, non-condensing
Physical Rugged aluminum housing with removable screw terminals

Introduction
UC Open XP and
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Installation and Start-up Guide 5 All rights reserved
Overall dimensions A:
B:
10-5/8 in. (27.0 cm)
3 in. (7.6 cm)
Mounting dimensions C:
D:
E:
10-3/16 in. (25.9 cm)
1-1/2 in. (3.8 cm)
13/64 in. (.5 cm)
Depth 1-1/2 in. (.8 cm)
Weight .73 lbs (.33 kg)
Listed by UL-916, (Canadian Std C22.2 No. 205-M1983), CE, FCC Part 15-Subpart B-Class
A
Safety considerations
WARNING
Disconnect electrical power to the UC Open XP before wiring it. Failure to follow this warning
could cause electrical shock, personal injury, or damage to the controller.

Installing the UC Open XP
UC Open XP and
UC Open XP IO Carrier Proprietary and Confidential CARRIER CORPORATION ©2017
Installation and Start-up Guide 6 All rights reserved
To install the UC Open XP:
1 Mount the controller (page 6).
2 Wire the controller for power (page 6).
3 Set the controller's address (page 7).
4 Wire the controller to the BACnet MS/TP or BACnet ARC156 network (page 7).
5 Wire expanders to the controller (page 14).
6 Wire inputs and outputs (page 9).
7 Wire devices to the Rnet port (page 18).
Mounting the UC Open XP
WARNING
When you handle the UC Open XP:
•Do not contaminate the printed circuit board with fingerprints, moisture, or any foreign material.
•Do not touch components or leads.
•Handle the board by its edges.
•Isolate from high voltage or electrostatic discharge.
•Ensure that you are properly grounded.
Screw the UC Open XP into an enclosed panel using the mounting slots on the cover plate. Leave about 2 in. (5
cm) on each side of the controller for wiring. See mounting dimensions in Specifications.
If using expanders, see Installing an expander before mounting the controller.
Wiring the UC Open XP for power
WARNING
Do not apply line voltage (mains voltage) to the controller's ports and terminals.
CAUTIONS
•The UC Open XP is powered by a Class 2 power source. Take appropriate isolation measures when mounting
it in a control panel where non-Class 2 circuits are present.
•Carrier controllers can share a power supply as long as you:
•Maintain the same polarity.
○Use the power supply only for Carrier controllers.
Installing the UC Open XP

Installing the UC Open XP
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Installation and Start-up Guide 7 All rights reserved
To wire for power
1 Turn off the UC Open XP's power switch to prevent it from powering up before you can verify the correct
voltage.
2 Remove primary power from the 24 Vac transformer.
3 Pull the screw terminal connector from the controller's power terminals labeled
Gnd
and
24 Vac
.
4 Connect the transformer wires to the screw terminal connector.
5 Apply primary power to the transformer.
6 Measure the voltage at the UC Open XP's power screw terminal connector to verify that the voltage is within
the operating range of 21.6 - 26.4 Vac.
7 Insert the screw terminal connector into the UC Open XP's power terminals.
8 Turn on the UC Open XP's power switch.
9 Verify that the Power LED is on and the Run LED is blinking.
Addressing the UC Open XP
The UC Open XP's two rotary switches determine its MAC address when it is placed on a BACnet MS/TP network.
The rotary switches define the MAC address portion of the device's BACnet address, which is composed of the
network address and the MAC address.
1 Turn on the controller's power.
2 Using the rotary switches, set the controller's address. Set the
Tens
(
10's
) switch to the tens digit of the
address, and set the
Ones
(
1's
) switch to the ones digit.
EXAMPLE
If the controller’s address is 25, point the arrow on the
Tens
(
10's
) switch to 2 and the arrow on
the
Ones
(
1's
) switch to 5.
10's
1's
1
3
4
5
2
7
8
9
6
0
1
3
4
5
2
7
8
9
6
0
3 Turn on the controller's power.
NOTE
The controller reads the address each time you apply power to it.
CAUTION
The factory default setting is
00
and must be changed to successfully install your UC Open XP.
Wiring for communications
The UC Open XP communicates using BACnet on the following types of network segments:
•MS/TP communicating at 9600 bps, 19.2 kbps, 38.4 kbps, or 76.8 kbps
•ARC156 communicating at 156 kbps
NOTE
For more networking details, see the Open Controller Network Wiring Installation Guide.

Installing the UC Open XP
UC Open XP and
UC Open XP IO Carrier Proprietary and Confidential CARRIER CORPORATION ©2017
Installation and Start-up Guide 8 All rights reserved
Wiring specifications for BACnet MS/TP and ARC156
Cable: 22 AWG or 24 AWG, low-capacitance, twisted, stranded, shielded copper wire
Maximum length: 2000 feet (610 meters)
WARNING
Do not apply line voltage (mains voltage) to the controller's ports and terminals.
To wire the controller to the network
1 Pull the screw terminal connector from the controller's power terminals labeled
Gnd
and
24 Vac
.
2 Check the communications wiring for shorts and grounds.
3 Connect the communications wiring to the BACnet MS/TP
or
to the BACnet ARC156 port.
NOTE
Use the same polarity throughout the network segment.
4 For MS/TP, verify the jumpers are set to 485-2w and EIA-485. They are not used for ARC156.
5 Set the communication type and baud rate.
For...
Set Communications
Selection jumper to...
Set DIP switches 1 and 2
to...
Set DIP switches 3 and 4
to...
MS/TP
MS/TP
The appropriate baud rate.
See the
MS/TP Baud
diagram on the controller.
Off/Off
ARC156
ARC156
N/A. Baud rate will be 156
kbps regardless of the DIP
switch settings.
On/On
NOTE
Use the same baud rate for all controllers on the network segment.
6 Wire the controllers on an MS/TP or ARC156 network segment in a daisy-chain configuration.
7 If the UC Open XP is at either end of a network segment, connect a BT485 to the UC Open XP.
8 Insert the power screw terminal connector into the UC Open XP's power terminals.
9 Verify communication with the network by viewing a Module Status report in the i-Vu® interface.

Installing the UC Open XP
UC Open XP and
UC Open XP IO Carrier Proprietary and Confidential CARRIER CORPORATION ©2017
Installation and Start-up Guide 9 All rights reserved
Wiring inputs and outputs
WARNING
Do not apply line voltage (mains voltage) to the controller's ports and terminals.
See Appendix A (page 33) to print a blank wire list.
Input wiring specifications
Input
Maximum length
Minimum gauge
Shielding
0–5 Vdc
0–10 Vdc
500 feet
(152 meters)
22 AWG 100 feet Unshielded
100 - 500 feet Shielded
0–20 mA 1000 feet
(305 meters)
22 AWG 100 feet Unshielded
100 - 1000 feet Shielded
Thermistor
Dry contact
Pulse counter
TLO
500 feet
(152 meters)
22 AWG 100 feet Unshielded
100 - 500 feet Shielded
RTD 100 feet
(30 meters)
22 AWG Shielded
ZS or SPT sensors 500 feet
(152 meters)
18 AWG
22 AWG
Shielded or
unshielded
Wireless Adapter for
Wireless sensors
500 feet
(152 meters)
22 AWG Shielded or
unshielded
Equipment Touch
device
500 feet
(152 meters)
22 AWG (7x0096) bare
copper
If shielded, Aluminum/Mylar
shield (100% coverage) with TC
drain wire
Inputs
The UC Open XP has 12 inputs that accept the following signal types.
Signal Type
Description
Thermistor Precon type 2 (10 kOhm at 77°F). Input voltages should be from 0.489 Vdc
to 3.825 Vdc for thermistors.
Dry contact A 5 Vdc wetting voltage detects contact position, resulting in a 1 mA
maximum sense current when the contacts are closed.
0–5 Vdc
0–10 Vdc
The input impedance of the UC Open XP is approximately 20 kOhm.

Installing the UC Open XP
UC Open XP and
UC Open XP IO Carrier Proprietary and Confidential CARRIER CORPORATION ©2017
Installation and Start-up Guide 10 All rights reserved
Signal Type
Description
0–20 mA The input resistance on the positive (+) terminal is 250 Ohms. The
Aux
Power Out
connector is capable of supplying 24 Vdc to multiple 4–20 mA
transducers, but the total current demanded must not exceed 200 mA. If the
voltage measured from the
Aux Power Out
connector to
Gnd
is less than 18
Vdc, you need to use an external power supply.
RTD Platinum - 1 kOhm at 32°F (0°C)
Nickel/Iron - 1 kOhm at 70°F (21°C)
Balco TS8000 - 1 kOhm at 70°F (21°C)
Input voltages should be from 0.6–1.2 V
Pulse counter* UI-2 and UI-2 only:
Maximum of 10 pulses per second. Minimum pulse width required for each
pulse:
•ON to OFF time (half cycle) is 50 msec
•ON to OFF to ON time (full cycle) is msec
*The UC Open XP can perform pulse counting for dry contact or voltage inputs if you assign the input to a Pulse
to Analog Input microblock.
Binary outputs
The UC Open XP has 6 binary outputs. Each output is a dry contact that must be powered from a Class 2 power
source.
To size output wiring, consider the following:
•Total loop distance from the power supply to the controller, and then to the controlled device
NOTE
Include the total distance of actual wire. For 2-conductor wires, this is twice the cable length.
•Acceptable voltage drop in the wire from the controller to the controlled device
•Resistance (Ohms) of the chosen wire gauge
•Maximum current (Amps) the controlled device requires to operate
Analog outputs
The UC Open XP has 6 analog outputs:
•1 and 2 are configurable for 0-10 V or 0-20 mA
•3, 4, 5, and 6 are 0-10 V only
The controlled device must share the same ground as the UC Open XP and have the following input impedance:
0–10 Vdc
0–20 mA
min 500 Ohms
max 800 Ohms

Installing the UC Open XP
UC Open XP and
UC Open XP IO Carrier Proprietary and Confidential CARRIER CORPORATION ©2017
Installation and Start-up Guide 11 All rights reserved
To wire inputs and outputs on the UC Open XP
1 Turn
off
the UC Open XP's power.
2 Connect the input wiring to the screw terminals on the UC Open XP.

Installing the UC Open XP
UC Open XP and
UC Open XP IO Carrier Proprietary and Confidential CARRIER CORPORATION ©2017
Installation and Start-up Guide 12 All rights reserved
NOTES
○If using shielded wire, connect the shield to the GND terminal with the ground wire. Tape off the shield
wire at the sensor end.
○Connect the shield wire to the
GND
terminal with the ground wire.
○Use only UI-1 or UI-2 for pulse counter or timed local override.
○For an internally-powered 4-20 mA sensor, wire the sensor's positive terminal to the
+
terminal on the UC
Open XP's
Aux Power Out
port. Wire the sensor's negative terminal to an input's
+
terminal.
3 Set the appropriate jumpers on the UC Open XP.
To use...
For...
Any input Thermistor
Dry contract
0–5 Vdc
0-10 Vdc
0–20 mA
RTD
Set each input's
Universal Input
Mode Select
jumper to the
type of signal the
input will receive.
Aux Power
Out port
Internally-powered
4-20 mA
Set the
Select
jumper to
+5V
or
+24V
as
required by the sensor.
4 Connect the binary output wiring to the screw terminals on the UC Open XP and to the controlled device.

Installing the UC Open XP
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Installation and Start-up Guide 13 All rights reserved
5 Connect the analog output wiring to the screw terminals on the UC Open XP and to the controlled device.
6 Set the
AO Mode Select
jumper to the type of device you are wiring the output to.
7 Turn
on
the UC Open XP's power.

Installing the UC Open XP IO expander
UC Open XP and
UC Open XP IO Carrier Proprietary and Confidential CARRIER CORPORATION ©2017
Installation and Start-up Guide 14 All rights reserved
1 Mount the expander. (page 14)
2 Wire the expander for power. (page 15)
3 Wire inputs and outputs. (page 17)
CAUTION
Do not change the rotary switch address from the default setting of 1.
To mount and attach the UC Open XP IO
WARNING
When you handle the UC Open XP IO:
•Do not contaminate the printed circuit board with fingerprints, moisture, or any foreign material.
•Do not touch components or leads.
•Handle the board by its edges.
•Isolate from high voltage or electrostatic discharge.
•Ensure that you are properly grounded.
Wiring restrictions for connecting the UC Open XP IO to the UC Open XP
○Maximum length: 100 feet (30 meters)
○22 or 24 AWG, low-capacitance, twisted, stranded, shielded copper wire
You can mount the UC Open XP IO in one of the following locations:
•On top of a UC Open XP, using the two allen cap screws provided. Connect Gnd to Gnd, Xnet- to Xnet-, Xnet+
to Xnet+.
Installing the UC Open XP IO expander

Installing the UC Open XP IO expander
UC Open XP and
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Installation and Start-up Guide 15 All rights reserved
•Beside the UC Open XP, by screwing the UC Open XP IO into an enclosed panel using the mounting slots on
the cover plate. Leave about 2 in. (5 cm) on each side of the expander for wiring. Mounting hole dimensions
1.5" from the left (width) by 10.2" (height). Connect Gnd to Gnd, Xnet- to Xnet-, Xnet+ to Xnet+. You can
mount the UC Open XP IO up to 100 ft away from the UC Open XP.
To wire for power
Older models of the UC Open XP IO have a power jumper that you must set to turn the expander on and off.
CAUTIONS
•The UC Open XP IO expander is powered by a Class 2 power source. Take appropriate isolation measures
when mounting it in a control panel where non-Class 2 circuits are present.
•For the UC Open XP to recognize an attached expander, you must turn on the expander before you turn on the
UC Open XP.
1 Pull the screw terminal connector from the controller's power terminals labeled
Gnd
and
24 Vac
.
2 Ground shielded wire to the UC Open XP IO's ground terminal.
3 Set the configuration jumpers for inputs 9 through 16 for thermistor/dry contact or 0-5 Vdc.
4 Insert the power screw terminal connector into the UC Open XP's power terminals.
5 Verify that the
Power
LED is on and the
Run
LED is blinking.
Wiring inputs and outputs
WARNING
Do not apply line voltage (mains voltage) to the controller's ports and terminals.
See Appendix A (page 33) to print a blank wire list.

Installing the UC Open XP IO expander
UC Open XP and
UC Open XP IO Carrier Proprietary and Confidential CARRIER CORPORATION ©2017
Installation and Start-up Guide 16 All rights reserved
Input wiring specifications
Input
Maximum length
Minimum gauge
Shielding
0–5 Vdc 500 feet
(152 meters)
22 AWG 100 feet Unshielded
100 - 500 feet Shielded
Thermistor
Dry contact
Pulse counter
TLO
500 feet
(152 meters)
22 AWG 100 feet Unshielded
100 - 500 feet Shielded
Inputs on the UC Open XP IO
The UC Open XP IO has 16 inputs that accept the following signal types:
Signal Type
Description
Thermistor Precon type 2 (10 kOhm at 77°F). Input voltages should be from 0.489 Vdc to 3.825 Vdc
for thermistors.
Dry contact A 5 Vdc wetting voltage detects contact position, resulting in a 1 mA maximum sense
current when the contacts are closed.
0–5 Vdc The input impedance of the UC Open XP IO is approximately 20 kOhm.
Pulse counter 10 pulses per second. Minimum pulse width (on or off time) required for each pulse is 50
msec.
Binary outputs
The UC Open XP IO has 8 binary outputs. Each output is a dry contact that must be powered from a Class 2 power
source.
To size output wiring, consider the following:
•Total loop distance from the power supply to the expander, and then to the controlled device
NOTE
Include the total distance of actual wire. For 2-conductor wires, this is twice the cable length.
•Acceptable voltage drop in the wire from the expander to the controlled device
•Resistance (Ohms) of the chosen wire gauge
•Maximum current (Amps) the controlled device requires to operate