WattMaster WCC III User Manual part 10

10. RS-485 Communications and Troubleshooting

WCC III

10. RS-485 Communications and Troubleshooting

T ABLE OF CONTENTS

SECTION 10: RS-485 COMMUNICA TIONS AND TROUBLESHOOTING

WCC III – MCD and SAT III Type Controllers “RS-485 Network Loop”

Communications .......................................10-1

SAT 3C/D/F TUC Loop Communications ...10-2

RS-485 Wire Considerations .....................10-3

Power and Switchable RS-485

Communications Board ............................10-3

24VAC Power Wiring Considerations .......10-5

Typical WCC III System Communications Wiring – Not the recommended and

preferred way ............................................10-6

Typical WCC III System Communications Wiring – The recommended and

preferred way ............................................10-7

Lightning Suppression ..............................10-8

SAT III Communications Troubleshooting with a

Digital Voltmeter .....................................10-10

SAT 3C/D/F Communications Troubleshooting with a

Digital Voltmeter .....................................10-11

SAT 3P Communications Troubleshooting with a

Digital Voltmeter .....................................10-13

TUC-2R Communications Troubleshooting with a

Digital Voltmeter .....................................10-14

VAVZ II Communications Troubleshooting with a

Digital Voltmeter .....................................10-16

TUC-5R Communications Troubleshooting with a

Digital Voltmeter .....................................10-17

RTU-17 Communications Troubleshooting with a

Digital Voltmeter .....................................10-19

MCD Communications Troubleshooting

with a Digital Voltmeter ...........................10-9

Global Bridge Communications Troubleshooting with a

Digital Voltmeter .....................................10-21

Replacing RS-485 Driver Chips ...............10-22

SECTION 10: RS-485 COMMUNICA TIONS AND TROUBLESHOOTING

__________________________________________

10. RS-485 COMMUNICATIONS

RS-485 Network Loop Communications

WCC III – MCD and SAT III Type Controllers “RS-485 Network Loop” Communications

The SAT III type controllers use a proprietary RS-485-based protocol, and it is based on packetized data in predeﬁ ned parameter blocks. Troubleshooting of the SAT III type controllers’ RS-485 communications loop is possible with a Digital Voltmeter.

(The SAT II was based on Manchester encoded data, and was very reliable, but was impossible to troubleshoot with a Digital Voltmeter.)

For the WCC III - MCD system, WattMaster Controls has developed a new, isolated RS-485 communication bus that can support 239 SAT III type controllers on up to four separate communications channels (loop connections). A single channel (loop connection) can support up to 60 SAT III type controllers on one communications loop. This is for redundant operation; if an RS-485 communications channel goes down, it does not cause other SAT III type controllers on the any of the other loops to lose communications.

The maximum distance speciﬁ ed for RS-485 communications is 4000 feet. Using multiple channels (loop connections), it is possible to go 4000 feet in one direction and 4000 feet in yet another direction using the two communications channels (loop connections) that are provided on the back of the standard WCC III - MCD.

PLEASE NOTE: There are two physical RS-485 channels

(loop connections ) on the back of the standard WCC III - MCD computer. T wo more ph ysical RS-485 loops are available as an option for larger loop sizes (WattMaster part PL1 0 1 97 4 ).

This WCC III communications loop should also be thought of as a major component of the WCC III system, not just a communications loop that only connects SAT III type controllers to SAT III type controllers. On this proprietary RS-485 communications loop, the following commands are broadcast many times a second: Time, Week Schedules, Global Binary, Global Analogs, Optimal Starts, Overrides, PID programs, Duty Cycles programs, Proportional programs, and Tenant Overrides. These commands are broadcast from the WCC III - MCD to all of the SAT III Controllers and all of the SAT 3C/D/F/P Controllers, as well as any TUC Controllers that are connected to the SAT 3C/D/F Controllers. If your RS-485 communications wiring has a faulty or intermittent connection to any of the SA T III type controllers, then a problem will result in the proper operation of the WCC III system.

WCC III Technical Guide

10-1

10. RS-485 COMMUNICATIONS

REAR PROFILE VIEW WCC I II - MCD (STANDARD WITH TWO SAT III COMMUNICATIONS CONNECTI ONS) REAR PROFILE VIEW WCC II I - MCD (WITH OPTIONAL TWO MORE SAT III COMMUNICATIONS CONNE CTIONS)

SA T 3C/D/F TUC Loop Communications

The SAT 3C/D/F TUC Loop Communications

The software that is in the “old” existing TUC Controllers that were connected to the “old” SAT 2c/d Controllers does not need to be changed. WattMaster Controls decided to use the same communications protocol to ease the replacement of the SA T 2C/D controllers. Do not connect this loop to the SAT III “network” communications loop as communication-related problems will result.

PLEASE NOTE: Normally, all of the RS-485 wiring is

wired “R ” to “R,” “T” to “T, ” and “SHLD” to “SHLD” or “SH.” This method of connection works for the wiring from TUC Controller to TUC Controller. But, on the SA T 3C/D/F Controller, the wire from the TUC “R” connection must be wired to the SA T 3C/D/F “T” connection, and the SAT 3C/D/F Controller “R” connection must be wired to the TUC “T” connecti on.

Figure 10-1: Rear Views of the WCC III – MCD showing SAT III RS-485 Communication Connections

Figure 10-2: Proﬁ le of SAT III and SAT 3C/D/F showing the SAT III and TUC RS-485 Communication Connections

10-2

WCC III Technical Guide

10. RS-485 COMMUNICATIONS

<<<LOCAL LOOP>>> AZWR-LL-WG-18>>> E76191 CL2P 18AWG (UL) 012112 FT

<<<NETWORK LOOP>>> AZWR-NL-WR-18>>> E76191 CL2P 18AWG (UL) 012112 FT

WATTMASTER LOCAL LOOP WIRE

WATTMASTER NETWORK LOOP WIRE

RS-485 Wire & P ower and Switchable RS-485 Communications Board

RS-485 Wire Considerations

The RS-485 wire speciﬁ cations are generally a stranded 18- gauge, 2-wire twisted pair with shield. 18-gauge stranded wire is mandatory to ensure a good connection with the ¼-inch Sta-Con connectors which are used to terminate the wires at the WCC III MCD and at the satellite controllers.

The old SAT II Manchester communications loop was supposed to have used a 2-wire twisted pair with shield, but this was not used in every installation. This old SAT II communications loop should not be used for the new SAT III communications loop. A new RS485 communications loop should be run to each new replacement SAT III Controller. The shield wire must be used on the new SAT III Controller as it provides a “ground” reference for the RS-485 communication loop.

W attMaster Controls sells two versions of 18-gauge, 2-wire twisted pair with shield communications wire:

• W attMaster part #WR-NL-WR-18 - marked “Network

Loop” with a red stripe for rapid identiﬁ cation. This wire should be run from the WCC III - MCD to the SAT III, SAT 3C/D/F, SAT 3P, and then to the next SAT 3-type controllers.

• W attMaster part #WR-LL-WG-18 - marked “Local

Loop” with a green stripe for rapid identiﬁ cation for the TUC loops that run from the SAT 3C/D/F controllers to the TUC controllers.

Figure 10-3: WattMaster Controls various communications loop wire

Power and Switc hable RS-485 Communications Board

“Wire Nuts” on the RS-485 communications loop should be avoided at all costs. As an alternative to the “Wire Nuts”, WattMaster Controls has a Power and Switchable RS-485 Communications Board - WattMaster part #PL102224. The Power and Switchable RS-485 Communications Board can be thought of as a 24-VAC power and communication distribution system for the SAT III communications loop that will aid in initial startup and future troubleshooting of the SAT III communications loop. The Power and Switch Boards should be used on a ﬂ oor-by-ﬂ oor basis. The board is sold alone or in a small metal electrical enclosure. See Figure 10-4.

This circuit board was designed to be used as a central connection point for the SAT III communications loop. The eight switches are provided only to disconnect the RS-485 communications loop for troubleshooting purposes.

Wiring for the communication connections are as follows: “R” to “R,” “T” to “T,” and “SHLD” to “SHLD” or “SH.” Connect the wiring from the SAT III to a SAT III, SAT 3C/D/F, or SAT 3P Controller. These eight push-button switches only disconnect the communications loop. THEY DO NOT SWITCH POWER ON/ OFF .

This circuit board may be also used as a separate central connection point for the SAT 3C/D/F - TUC communications loop.

Wiring for the communications connections are as follows: “R” to “R,” “T” to “T,” and “SHLD” to “SHLD” or “SH.” Connect the wiring from TUC controller to TUC controller. But on the SAT 3C/D/F controller, the TUC “R” connection must be wired to the SAT 3C/D/F “T” connection, and the SAT 3C/D/F controller “R” connection must be wired to the TUC “T” connection.

WCC III Technical Guide

10-3

10. RS-485 COMMUNICATIONS

Pow er and Switchable RS-485 Communications Board

10-4

Figure 10-4: Power and Switchable RS-485 Communications Board Application Drawing

WCC III Technical Guide

10. RS-485 COMMUNICATIONS

24V AC Pow er Wiring

24V AC P o wer Wiring Considerations

You do not have to use the 24VAC connections on the Power and Switchable RS-485 Communications Board, as each SAT III panel should have its own 120VAC-to-24VAC transformer. However, WattMaster Controls included the 24VAC connections on the Power and Switchable RS-485 Communications Board as a convenience option for 24VAC power distribution wiring.

When using the Power and Switchable RS-485 Communications Board with a common 24VAC (250VA MAX) transformer, the24VAC and GND polarity must be maintained on each and every 24VAC & GND power connection.

• Each SAT III draws - 15VA (No more than 15

SAT III max per board with a 250 VA - 24 VAC transformer)

• Each SAT 3C/D/F draws - 10VA (No more than

24 SAT 3C/D/F max per board with a 250 VA - 24 VAC transformer)

• Each TUC-2R draws - 5VA (No more than 32

TUC-2R max per board with a 250 VA - 24 VAC transformer)

WIRE RESISTANCE STANDARDS

• 18-Gauge WIRE OHMS PER FOOT = 0.00639

• 16-Gauge WIRE OHMS PER FOOT = 0.00402

AMPERAGE CURRENT DRAW for WattMaster Controls products

• SAT III controller is 0.63 AMPS

• SAT 3C/D/F controller is 0.42 AMPS

• TUC-2R controller is 0.21 AMPS with actuator

• TUC5-R controller is 0.34 AMPS

Example 1:

A single SAT III controller will have a voltage drop of 0.50 volts with 100 feet of wire run when using 16-gauge wire. No more than 2 volts of drop is allowed for any WattMaster product. Two SAT III controllers on the same loop will have twice the voltage drop for the same distance.

0.506 Volts of loss = “0.63” x “0.00402” x “100 feet” x “2”

• Each TUC-5R draws - 8VA (No more than 28

TUC-R max per board with a 250 VA - 24 VAC transformer)

• External relays and contactors are not included, but

need to be considered for total VA draw.

PLEASE NOTE: Vol tage loss in wire calculations must also

be considered and are listed below .

You must use the formula below when calculating max wire distance and the resulting voltage loss that can and will occur when running SAT III and TUC power wiring.

The formula is as follows: “VL” = “A” x “WR” x “DIF” x “2” VL = Voltage Loss, A = AMP Draw , WR = Wire Resistance, DIF =

Distance In Feet, 2 = 2 Wires (1 Wire in each direction!)

Example 2:

A single TUC-2R controller will have a voltage drop of 0.671 volts with 250 feet of wire run when using 18-gauge wire. No more than 2 volts of drop is allowed for any WattMaster product. Two TUC2R controllers on the same loop will have twice the voltage drop for the same distance.

0.671 Volts of loss = “0.21” x “0.00639” x “250 feet” x “2”

Example 3:

A single SAT 3C/D/F controller will have a voltage drop of 1.69 volts with 500 feet of wire run when using 16-gauge wire. No more than 2 volts of drop is allowed for any WattMaster product. Two SAT III controllers on the same loop will have twice the voltage drop for the same distance.

1.689 Volts of loss = “0.42” x “0.00402” x “500 feet” x “2”

WCC III Technical Guide

10-5

10. RS-485 COMMUNICATIONS

8

7

SATADDRESS

2 1

4

8

A3WIREROOMSENSORWILLNOT REQUIREALOADRESISTORWHENSET FORA1VOLTINPUT.

WattMasterControlsInc.

BINARY INPUTS

L8

ONOFF

128

32 16

64

L4 L3 L2 L1

L6 L5

L7

L11

L12

ONOFF

L10 L9

ONOFF

L15

L16

L14 L13

CH

4

3

5 6

2

1

LOCALSET

STATUS2

STATUS3

STATUS1

HSSXMIT

LOCALSET

LOCALSETDISABLE

BATTON/OFF PULSEINPUT

OPTION1

TEST

OPTION3 OPTION2

ONOFF

STATUS

HSSREC

SATXMIT

SATREC

ANALOGINPUT JUMPERSELECTION

A2WIREROOMSENSORWILLREQUIRE A300OHMLOADRESISTORWHENSET FORA1VOLTINPUT.

A4TO20mASENSORWILLREQUIREA 50OHMLOADRESISTORWHENSETFOR A1VOLTINPUT,ORA250OHMLOAD RESISTORWHENSETFORA5VOLTINPUT.

CURRENT

INPUT

THERMISTOR INPUT

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

0-10V

THERM

0TO10V INPUT

0TO5V INPUT

0TO1V INPUT

0-10V

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

THERM

0-1V

0-5V

0-10V

THERM

PROGRAMMABLECONTROLLER

SATIII

100VA

TRANSFORMER

SWITCH DISCONNECT

INTERPANEL

100VA

TRANSFORMER

SWITCH DISCONNECT

INTERPANEL

D

8

7

SATADDRESS

2 1

4

8

A3WIREROOMSENSORWILLNOT REQUIREALOADRESISTORWHENSET FORA1VOLTINPUT.

WattMasterControlsInc.

BINARY INPUTS

L8

ONOFF

128

32 16

64

L4 L3 L2 L1

L6 L5

L7

L11

L12

ONOFF

L10 L9

ONOFF

L15

L16

L14 L13

CH

4

3

5 6

2

1

LOCALSET

STATUS2

STATUS3

STATUS1

HSSXMIT

LOCALSET

LOCALSETDISABLE

BATTON/OFF PULSEINPUT

OPTION1

TEST

OPTION3 OPTION2

ONOFF

STATUS

HSSREC

SATXMIT

SATREC

ANALOGINPUT JUMPERSELECTION

A2WIREROOMSENSORWILLREQUIRE A300OHMLOADRESISTORWHENSET FORA1VOLTINPUT.

A4TO20mASENSORWILLREQUIREA 50OHMLOADRESISTORWHENSETFOR A1VOLTINPUT,ORA250OHMLOAD RESISTORWHENSETFORA5VOLTINPUT.

CURRENT INPUT

THERMISTOR INPUT

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

0-10V

THERM

0TO10V INPUT

0TO5V INPUT

0TO1V INPUT

0-10V

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

THERM

0-1V

0-5V

0-10V

THERM

PROGRAMMABLECONTROLLER

SATIII

100VA

TRANSFORMER

SWITCH DISCONNECT

INTERPANEL

100VA

TRANSFORMER

SWITCH DISCONNECT

INTERPANEL

D

8

7

SATADDRESS

2 1

4

8

A3WIREROOMSENSORWILLNOT REQUIREALOADRESISTORWHENSET FORA1VOLTINPUT.

WattMasterControlsInc.

BINARY INPUTS

L8

ONOFF

128

32 16

64

L4 L3 L2 L1

L6 L5

L7

L11

L12

ONOFF

L10 L9

ONOFF

L15

L16

L14 L13

CH

4

3

5 6

2

1

LOCALSET

STATUS2

STATUS3

STATUS1

HSSXMIT

LOCALSET

LOCALSETDISABLE

BATTON/OFF PULSEINPUT

OPTION1

TEST

OPTION3 OPTION2

ONOFF

STATUS

HSSREC

SATXMIT

SATREC

ANALOGINPUT JUMPERSELECTION

A2WIREROOMSENSORWILLREQUIRE A300OHMLOADRESISTORWHENSET FORA1VOLTINPUT.

A4TO20mASENSORWILLREQUIREA 50OHMLOADRESISTORWHENSETFOR A1VOLTINPUT,ORA250OHMLOAD RESISTORWHENSETFORA5VOLTINPUT.

CURRENT INPUT

THERMISTOR INPUT

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

0-10V

THERM

0TO10V

INPUT

0TO5V INPUT

0TO1V INPUT

0-10V

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

THERM

0-1V

0-5V

0-10V

THERM

PROGRAMMABLECONTROLLER

SATIII

100VA

TRANSFORMER

SWITCH DISCONNECT

INTERPANEL

100VA

TRANSFORMER

SWITCH DISCONNECT

INTERPANEL

D

100VA

TRANSFORMER

SWITCH DISCONNECT

INTERPANEL

D

8

7

SATADDRESS

2 1

4

8

A3WIREROOMSENSORWILLNOT REQUIREALOADRESISTORWHENSET FORA1VOLTINPUT.

WattMasterControlsInc.

BINARY INPUTS

L8

ONOFF

128

32 16

64

L4 L3 L2 L1

L6 L5

L7

L11

L12

ONOFF

L10 L9

ONOFF

L15

L16

L14 L13

CH

4

3

5 6

2

1

LOCALSET

STATUS2

STATUS3

STATUS1

HSSXMIT

LOCALSET

LOCALSETDISABLE

BATTON/OFF PULSEINPUT

OPTION1

TEST

OPTION3 OPTION2

ONOFF

STATUS

HSSREC

SATXMIT

SATREC

ANALOGINPUT JUMPERSELECTION

A2WIREROOMSENSORWILLREQUIRE A300OHMLOADRESISTORWHENSET FORA1VOLTINPUT.

A4TO20mASENSORWILLREQUIREA 50OHMLOADRESISTORWHENSETFOR A1VOLTINPUT,ORA250OHMLOAD RESISTORWHENSETFORA5VOLTINPUT.

CURRENT INPUT

THERMISTOR INPUT

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

0-10V

THERM

0TO10V

INPUT

0TO5V INPUT

0TO1V INPUT

0-10V

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

THERM

0-1V

0-5V

0-10V

THERM

PROGRAMMABLECONTROLLER

SATIII

100VA

TRANSFORMER

SWITCH DISCONNECT

INTERPANEL

BASEMENT

1st Floor

2nd Floor

8

7

SATADDRESS

2 1

4

8

A3WIREROOMSENSORWILLNOT REQUIREALOADRESISTORWHENSET FORA1VOLTINPUT.

WattMasterControlsInc.

BINARY INPUTS

L8

ONOFF

128

32 16

64

L4 L3 L2 L1

L6 L5

L7

L11

L12

ONOFF

L10 L9

ONOFF

L15

L16

L14 L13

CH

4

3

5 6

2

1

LOCALSET

STATUS2

STATUS3

STATUS1

HSSXMIT

LOCALSET

LOCALSETDISABLE

BATTON/OFF PULSEINPUT

OPTION1

TEST

OPTION3 OPTION2

ONOFF

STATUS

HSSREC

SATXMIT

SATREC

ANALOGINPUT JUMPERSELECTION

A2WIREROOMSENSORWILLREQUIRE A300OHMLOADRESISTORWHENSET FORA1VOLTINPUT.

A4TO20mASENSORWILLREQUIREA 50OHMLOADRESISTORWHENSETFOR A1VOLTINPUT,ORA250OHMLOAD RESISTORWHENSETFORA5VOLTINPUT.

CURRENT INPUT

THERMISTOR INPUT

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

0-10V

THERM

0TO10V

INPUT

0TO5V INPUT

0TO1V INPUT

0-10V

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

THERM

0-1V

0-5V

0-10V

THERM

PROGRAMMABLECONTROLLER

SATIII

100VA

TRANSFORMER

SWITCH DISCONNECT

8

7

SATADDRESS

2 1

4

8

A3WIREROOMSENSORWILLNOT REQUIREALOADRESISTORWHENSET FORA1VOLTINPUT.

WattMasterControlsInc.

BINARY INPUTS

L8

ONOFF

128

32 16

64

L4 L3 L2 L1

L6 L5

L7

L11

L12

ONOFF

L10 L9

ONOFF

L15

L16

L14 L13

CH

4

3

5 6

2

1

LOCALSET

STATUS2

STATUS3

STATUS1

HSSXMIT

LOCALSET

LOCALSETDISABLE

BATTON/OFF PULSEINPUT

OPTION1

TEST

OPTION3 OPTION2

ONOFF

STATUS

HSSREC

SATXMIT

SATREC

ANALOGINPUT JUMPERSELECTION

A2WIREROOMSENSORWILLREQUIRE A300OHMLOADRESISTORWHENSET FORA1VOLTINPUT.

A4TO20mASENSORWILLREQUIREA 50OHMLOADRESISTORWHENSETFOR A1VOLTINPUT,ORA250OHMLOAD RESISTORWHENSETFORA5VOLTINPUT.

CURRENT INPUT

THERMISTOR INPUT

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

0-10V

THERM

0TO10V

INPUT

0TO5V INPUT

0TO1V INPUT

0-10V

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

THERM

0-1V

0-5V

0-10V

THERM

PROGRAMMABLECONTROLLER

SATIII

INTERPANEL

100VA

TRANSFORMER

8

7

SATADDRESS

2 1

4

8

A3WIREROOMSENSORWILLNOT REQUIREALOADRESISTORWHENSET FORA1VOLTINPUT.

WattMasterControlsInc.

BINARY INPUTS

L8

ONOFF

128

32 16

64

L4 L3 L2 L1

L6 L5

L7

L11

L12

ONOFF

L10 L9

ONOFF

L15

L16

L14 L13

CH

4

3

5 6

2

1

LOCALSET

STATUS2

STATUS3

STATUS1

HSSXMIT

LOCALSET

LOCALSETDISABLE

BATTON/OFF PULSEINPUT

OPTION1

TEST

OPTION3 OPTION2

ONOFF

STATUS

HSSREC

SATXMIT

SATREC

ANALOGINPUT JUMPERSELECTION

A2WIREROOMSENSORWILLREQUIRE A300OHMLOADRESISTORWHENSET FORA1VOLTINPUT.

A4TO20mASENSORWILLREQUIREA 50OHMLOADRESISTORWHENSETFOR A1VOLTINPUT,ORA250OHMLOAD RESISTORWHENSETFORA5VOLTINPUT.

CURRENT INPUT

THERMISTOR INPUT

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

0-10V

THERM

0TO10V

INPUT

0TO5V INPUT

0TO1V INPUT

0-10V

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

THERM

0-1V

0-5V

0-10V

THERM

PROGRAMMABLECONTROLLER

SATIII

100VA

TRANSFORMER

SWITCH DISCONNECT

INTERPANEL

8

7

SATADDRESS

2 1

4

8

A3WIREROOMSENSORWILLNOT REQUIREALOADRESISTORWHENSET FORA1VOLTINPUT.

WattMasterControlsInc.

BINARY INPUTS

L8

ONOFF

128

32 16

64

L4 L3 L2 L1

L6 L5

L7

L11

L12

ONOFF

L10 L9

ONOFF

L15

L16

L14 L13

CH

4

3

5 6

2

1

LOCALSET

STATUS2

STATUS3

STATUS1

HSSXMIT

LOCALSET

LOCALSETDISABLE

BATTON/OFF PULSEINPUT

OPTION1

TEST

OPTION3 OPTION2

ONOFF

STATUS

HSSREC

SATXMIT

SATREC

ANALOGINPUT JUMPERSELECTION

A2WIREROOMSENSORWILLREQUIRE A300OHMLOADRESISTORWHENSET FORA1VOLTINPUT.

A4TO20mASENSORWILLREQUIREA 50OHMLOADRESISTORWHENSETFOR A1VOLTINPUT,ORA250OHMLOAD RESISTORWHENSETFORA5VOLTINPUT.

CURRENT INPUT

THERMISTOR INPUT

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

0-10V

THERM

0TO10V INPUT

0TO5V INPUT

0TO1V INPUT

0-10V

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

THERM

0-1V

0-5V

0-10V

THERM

PROGRAMMABLECONTROLLER

SATIII

100VA

TRANSFORMER

SWITCH DISCONNECT

INTERPANEL

3rd Floor

8

7

SATADDRESS

2 1

4

8

A3WIREROOMSENSORWILLNOT REQUIREALOADRESISTORWHENSET FORA1VOLTINPUT.

WattMasterControlsInc.

BINARY INPUTS

L8

ONOFF

128

32 16

64

L4 L3 L2 L1

L6 L5

L7

L11

L12

ONOFF

L10 L9

ONOFF

L15

L16

L14 L13

CH

4

3

5 6

2

1

LOCALSET

STATUS2

STATUS3

STATUS1

HSSXMIT

LOCALSET

LOCALSETDISABLE

BATTON/OFF PULSEINPUT

OPTION1

TEST

OPTION3 OPTION2

ONOFF

STATUS

HSSREC

SATXMIT

SATREC

ANALOGINPUT JUMPERSELECTION

A2WIREROOMSENSORWILLREQUIRE A300OHMLOADRESISTORWHENSET FORA1VOLTINPUT.

A4TO20mASENSORWILLREQUIREA 50OHMLOADRESISTORWHENSETFOR A1VOLTINPUT,ORA250OHMLOAD RESISTORWHENSETFORA5VOLTINPUT.

CURRENT INPUT

THERMISTOR INPUT

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

0-10V

THERM

0TO10V

INPUT

0TO5V INPUT

0TO1V INPUT

0-10V

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

THERM

0-1V

0-5V

0-10V

THERM

PROGRAMMABLECONTROLLER

SATIII

100VA

TRANSFORMER

SWITCH DISCONNECT

INTERPANEL

100VA

TRANSFORMER

SWITCH DISCONNECT

INTERPANEL

D

100VA

TRANSFORMER

SWITCH DISCONNECT

INTERPANEL

D

4th Floor

4X4 HANDY BOX

WIRE NUTS

TO WCCIII - MCD

SAT III IN A ENCLOSURESAT3D INAENCLOSURE

2 - SAT III I N A DUAL ENCLOSURE

SAT III IN A ENCLOSURESAT3D INAENCLOSURE

SAT III IN A ENCLOSURE

SAT III IN A ENCLOSURESAT3D INAENCLOSURESAT3D IN A ENCLOSURE

SAT III IN A ENCL OSURESAT III IN A ENCLOSURE

SAT 3D IN A ENCL OSURE

Wrong Communications Wiring

Figure 10-5: Typical WCC III System Communications Wiring – Not the recommended and preferred way

Wiring of the WCC III RS-485 communications loop as represented in Figure 10-5 is not recommend for the following reasons:

1. The use of “Wire Nuts” to connect the communications wire at a central hub (the 4x4 handy box) and inside of a SA T III enclosure is not a good idea. The connections will oxidize over time and the resistance of the “Wire-Nutted” connections will increase over time. Generally speaking, the use of “Wire Nuts” can and will cause a problem with the WCC III communication loop at some point. Also, tugging or pulling on the WCC III communications wiring during troubleshooting or during routine maintenance can and generally will cause these “Wire Nuts” connections to break apart.

10-6

2. The haphazard way the WCC III communications wiring was run in Figure 10-5 is also not recommended. In this example, wiring was run from the 2nd ﬂ oor to the 4th ﬂ oor and then back to the 2nd ﬂ oor and then back to the 4th ﬂ oor again. The WCC III communications wiring should make sense and never jump ﬂ oors or go back down a ﬂ oor and then go back up a ﬂ oor. See Figure 10-6 which shows a diagram of how the WCC III communications wiring should be run and to use for troubleshooting purposes.

3. A Power and Switchable RS-485 communication board (PL102224) was not used on a ﬂ oor-by-ﬂ oor basis. Use of this board will aid in initial startup and in future troubleshooting.

WCC III Technical Guide

10. RS-485 COMMUNICATIONS

8

7

SATADDRESS21

4

8

A3WIREROOMSENSORWILLNOT

REQUIREALOADRESISTORWHENSET FORA1VOLTINPUT.

WattMasterControlsInc.

BINARY INPUTS

BINARY

INPUTS

L8

ONOFF

128

32 16

64

L4 L3 L2 L1

L6 L5

L7

L11

L12

ONOFF

L10 L9

ONOFF

L15

L16

L14 L13

CH

4

3

5 6

2

1

LOCALSET

STATUS2

STATUS3

STATUS1

HSSXMIT

LOCALSET

LOCALSETDISABLE

BATTON/OFF PULSEINPUT

OPTION1

TEST

OPTION3 OPTION2

ONOFF

STATUS

HSSREC

SATXMIT

SATREC

ANALOGINPUT JUMPERSELECTION

A2WIREROOMSENSORWILLREQUIRE

A300OHMLOADRESISTORWHENSET

FORA1VOLTINPUT.

A4TO20mASENSORWILLREQUIREA

50OHMLOADRESISTORWHENSETFOR

A1VOLTINPUT,ORA250OHMLOAD

RESISTORWHENSETFORA5VOLTINPUT.

CURRENT INPUT

THERMISTOR INPUT

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

0-10V

THERM

0TO10V INPUT

0TO5V INPUT

0TO1V INPUT

0-10V

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

THERM

0-1V

0-5V

0-10V

THERM

PROGRAMMABLECONTROLLER

SATIII

100VA

TRANSFORMER

SWITCH DISCONNECT

INTERPANEL

100VA

TRANSFORMER

SWITCH DISCONNECT

INTERPANEL

D

8

7

SATADDRESS21

4

8

A3WIREROOMSENSORWILLNOT REQUIREALOADRESISTORWHENSET

FORA1VOLTINPUT.

WattMasterControlsInc.

BINARY INPUTS

BINARY

INPUTS

L8

ONOFF

128

32 16

64

L4 L3 L2 L1

L6 L5

L7

L11

L12

ONOFF

L10 L9

ONOFF

L15

L16

L14 L13

CH

4

3

5 6

2

1

LOCALSET

STATUS2

STATUS3

STATUS1

HSSXMIT

LOCALSET

LOCALSETDISABLE

BATTON/OFF PULSEINPUT

OPTION1

TEST

OPTION3 OPTION2

ONOFF

STATUS

HSSREC

SATXMIT

SATREC

ANALOGINPUT JUMPERSELECTION

A2WIREROOMSENSORWILLREQUIRE

A300OHMLOADRESISTORWHENSET

FORA1VOLTINPUT.

A4TO20mASENSORWILLREQUIREA

50OHMLOADRESISTORWHENSETFOR

A1VOLTINPUT,ORA250OHMLOAD

RESISTORWHENSETFORA5VOLTINPUT.

CURRENT INPUT

THERMISTOR INPUT

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

0-10V

THERM

0TO10V INPUT

0TO5V INPUT

0TO1V INPUT

0-10V

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

THERM

0-1V

0-5V

0-10V

THERM

PROGRAMMABLECONTROLLER

SATIII

100VA

TRANSFORMER

SWITCH DISCONNECT

INTERPANEL

100VA

TRANSFORMER

SWITCH DISCONNECT

INTERPANEL

D

8

7

SATADDRESS

2 1

4

8

A3WIREROOMSENSORWILLNOT

REQUIREALOADRESISTORWHENSET

FORA1VOLTINPUT.

WattMasterControlsInc.

BINARY

INPUTS

BINARY INPUTS

L8

ONOFF

128

32 16

64

L4 L3 L2 L1

L6 L5

L7

L11

L12

ONOFF

L10 L9

ONOFF

L15

L16

L14 L13

CH

4

3

5 6

2

1

LOCALSET

STATUS2

STATUS3

STATUS1

HSSXMIT

LOCALSET

LOCALSETDISABLE

BATTON/OFF PULSEINPUT

OPTION1

TEST

OPTION3 OPTION2

ONOFF

STATUS

HSSREC

SATXMIT

SATREC

ANALOGINPUT JUMPERSELECTION

A2WIREROOMSENSORWILLREQUIRE A300OHMLOADRESISTORWHENSET

FORA1VOLTINPUT.

A4TO20mASENSORWILLREQUIREA 50OHMLOADRESISTORWHENSETFOR

A1VOLTINPUT,ORA250OHMLOAD

RESISTORWHENSETFORA5VOLTINPUT.

CURRENT INPUT

THERMISTOR INPUT

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

0-10V

THERM

0TO10V INPUT

0TO5V INPUT

0TO1V INPUT

0-10V

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

THERM

0-1V

0-5V

0-10V

THERM

PROGRAMMABLECONTROLLER

SATIII

100VA

TRANSFORMER

SWITCH DISCONNECT

INTERPANEL

100VA

TRANSFORMER

SWITCH DISCONNECT

INTERPANEL

D

100VA

TRANSFORMER

SWITCH DISCONNECT

INTERPANEL

D

8

7

SATADDRESS

2 1

4

8

A3WIREROOMSENSORWILLNOT

REQUIREALOADRESISTORWHENSET

FORA1VOLTINPUT.

WattMasterControlsInc.

BINARY

INPUTS

BINARY INPUTS

L8

ONOFF

128

32 16

64

L4 L3 L2 L1

L6 L5

L7

L11

L12

ONOFF

L10 L9

ONOFF

L15

L16

L14 L13

CH

4

3

5 6

2

1

LOCALSET

STATUS2

STATUS3

STATUS1

HSSXMIT

LOCALSET

LOCALSETDISABLE

BATTON/OFF PULSEINPUT

OPTION1

TEST

OPTION3 OPTION2

ONOFF

STATUS

HSSREC

SATXMIT

SATREC

ANALOGINPUT JUMPERSELECTION

A2WIREROOMSENSORWILLREQUIRE A300OHMLOADRESISTORWHENSET

FORA1VOLTINPUT.

A4TO20mASENSORWILLREQUIREA 50OHMLOADRESISTORWHENSETFOR

A1VOLTINPUT,ORA250OHMLOAD

RESISTORWHENSETFORA5VOLTINPUT.

CURRENT INPUT

THERMISTOR INPUT

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

0-10V

THERM

0TO10V INPUT

0TO5V INPUT

0TO1V INPUT

0-10V

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

THERM

0-1V

0-5V

0-10V

THERM

PROGRAMMABLE CONTROLLER

SATIII

100VA

TRANSFORMER

SWITCH DISCONNECT

INTERPANEL

BASEMENT

1st Floor

2nd Floor

8

7

SATADDRESS21

4

8

A3WIREROOMSENSORWILLNOT

REQUIREALOADRESISTORWHENSET

FORA1VOLTINPUT.

WattMasterControlsInc.

BINARY INPUTS

L8

ONOFF

128

32 16

64

L4 L3 L2 L1

L6 L5

L7

L11

L12

ONOFF

L10 L9

ONOFF

L15

L16

L14 L13

CH

4

3

5 6

2

1

LOCALSET

STATUS2

STATUS3

STATUS1

HSSXMIT

LOCALSET

LOCALSETDISABLE

BATTON/OFF PULSEINPUT

OPTION1

TEST

OPTION3 OPTION2

ONOFF

STATUS

HSSREC

SATXMIT

SATREC

ANALOGINPUT JUMPERSELECTION

A2WIREROOMSENSORWILLREQUIRE A300OHMLOADRESISTORWHENSET

FORA1VOLTINPUT.

A4TO20mASENSORWILLREQUIREA

50OHMLOADRESISTORWHENSET FOR

A1VOLTINPUT,ORA250OHMLOAD

RESISTORWHENSETFORA5VOLTINPUT.

CURRENT INPUT

THERMISTOR INPUT

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

0-10V

THERM

0TO10V INPUT

0TO5V INPUT

0TO1V INPUT

0-10V

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

THERM

0-1V

0-5V

0-10V

THERM

PROGRAMMABLECONTROLLER

SATIII

100VA

TRANSFORMER

SWITCH DISCONNECT

8

7

SATADDRESS

2 1

4

8

A3WIREROOMSENSORWILLNOT

REQUIREALOADRESISTORWHENSET

FORA1VOLTINPUT.

WattMasterControlsInc.

BINARY INPUTS

L8

ONOFF

128

32 16

64

L4 L3 L2 L1

L6 L5

L7

L11

L12

ONOFF

L10 L9

ONOFF

L15

L16

L14 L13

CH

4

3

5 6

2

1

LOCALSET

STATUS2

STATUS3

STATUS1

HSSXMIT

LOCALSET

LOCALSETDISABLE

BATTON/OFF PULSEINPUT

OPTION1

TEST

OPTION3 OPTION2

ONOFF

STATUS

HSSREC

SATXMIT

SATREC

ANALOGINPUT JUMPERSELECTION

A2WIREROOMSENSORWILLREQUIRE

A300OHMLOADRESISTORWHENSET

FORA1VOLTINPUT.

A4TO20mASENSORWILLREQUIREA

50OHMLOADRESISTORWHENSET FOR A1VOLTINPUT,ORA250OHMLOAD

RESISTORWHENSETFORA5VOLTINPUT.

CURRENT INPUT

THERMISTOR INPUT

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

0-10V

THERM

0TO10V INPUT

0TO5V INPUT

0TO1V INPUT

0-10V

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

THERM

0-1V

0-5V

0-10V

THERM

PROGRAMMABLECONTROLLER

SATIII

INTERPANEL

100VA

TRANSFORMER

8

7

SATADDRESS

2 1

4

8

A3WIREROOMSENSORWILLNOT

REQUIREALOADRESISTORWHENSET

FORA1VOLTINPUT.

WattMasterControlsInc.

BINARY

INPUTS

BINARY INPUTS

L8

ONOFF

128

32 16

64

L4 L3 L2 L1

L6 L5

L7

L11

L12

ONOFF

L10 L9

ONOFF

L15

L16

L14 L13

CH

4

3

5 6

2

1

LOCALSET

STATUS2

STATUS3

STATUS1

HSSXMIT

LOCALSET

LOCALSETDISABLE

BATTON/OFF PULSEINPUT

OPTION1

TEST

OPTION3 OPTION2

ONOFF

STATUS

HSSREC

SATXMIT

SATREC

ANALOGINPUT JUMPERSELECTION

A2WIREROOMSENSORWILLREQUIRE A300OHMLOADRESISTORWHENSET

FORA1VOLTINPUT.

A4TO20mASENSORWILLREQUIREA 50OHMLOADRESISTORW HE NSETFOR

A1VOLTINPUT,ORA250OHMLOAD

RESISTORWHENSETFORA5VOLTINPUT.

CURRENT INPUT

THERMISTOR INPUT

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

0-10V

THERM

0TO10V INPUT

0TO5V INPUT

0TO1V INPUT

0-10V

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

THERM

0-1V

0-5V

0-10V

THERM

PROGRAMMABLECONTROLLER

SATIII

100VA

TRANSFORMER

SWITCH DISCONNECT

INTERPANEL

8

7

SATADDRESS21

4

8

A3WIREROOMSENSORWILLNOT REQUIREALOADRESISTORWHENSET

FORA1VOLTINPUT.

WattMasterControlsInc.

BINARY INPUTS

BINARY

INPUTS

L8

ONOFF

128

32 16

64

L4 L3 L2 L1

L6 L5

L7

L11

L12

ONOFF

L10 L9

ONOFF

L15

L16

L14 L13

CH

4

3

5 6

2

1

LOCALSET

STATUS2

STATUS3

STATUS1

HSSXMIT

LOCALSET

LOCALSETDISABLE

BATTON/OFF PULSEINPUT

OPTION1

TEST

OPTION3 OPTION2

ONOFF

STATUS

HSSREC

SATXMIT

SATREC

ANALOGINPUT JUMPERSELECTION

A2WIREROOMSENSORWILLREQUIRE

A300OHMLOADRESISTORWHENSET

FORA1VOLTINPUT.

A4TO20mASENSORWILLREQUIREA

50OHMLOADRESISTORWHENSETFOR

A1VOLTINPUT,ORA250OHMLOAD

RESISTORWHENSETFORA5VOLTINPUT.

CURRENT INPUT

THERMISTOR INPUT

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

0-10V

THERM

0TO10V INPUT

0TO5V INPUT

0TO1V INPUT

0-10V

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

THERM

0-1V

0-5V

0-10V

THERM

PROGRAMMABLECONTROLLER

SATIII

100VA

TRANSFORMER

SWITCH DISCONNECT

INTERPANEL

3rd Floor

8

7

SATADDRESS

2 1

4

8

A3WIREROOMSENSORWILLNOT

REQUIREALOADRESISTORWHENSET

FORA1VOLTINPUT.

WattMasterControlsInc.

BINARY INPUTS

L8

ONOFF

128

32 16

64

L4 L3 L2 L1

L6 L5

L7

L11

L12

ONOFF

L10 L9

ONOFF

L15

L16

L14 L13

CH

4

3

5 6

2

1

LOCALSET

STATUS2

STATUS3

STATUS1

HSSXMIT

LOCALSET

LOCALSETDISABLE

BATTON/OFF PULSEINPUT

OPTION1

TEST

OPTION3 OPTION2

ONOFF

STATUS

HSSREC

SATXMIT

SATREC

ANALOGINPUT JUMPERSELECTION

A2WIREROOMSENSORWILLREQUIRE

A300OHMLOADRESISTORWHENSET FORA1VOLTINPUT.

A4TO20mASENSORWILLREQUIREA

50OHMLOADRESISTORWHENSETFOR A1VOLTINPUT,ORA250OHMLOAD

RESISTORWHENSETFORA5VOLTINPUT.

CURRENT INPUT

THERMISTOR INPUT

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

0-10V

THERM

0TO10V INPUT

0TO5V INPUT

0TO1V INPUT

0-10V

0-1V

0-5V

0-10V

THERM

0-1V

0-5V

THERM

0-1V

0-5V

0-10V

THERM

PROGRAMMABLECONTROLLER

SATIII

100VA

TRANSFORMER

SWITCH DISCONNECT

INTERPANEL

100VA

TRANSFORMER

SWITCH DISCONNECT

INTERPANEL

D

100VA

TRANSFORMER

SWITCH DISCONNECT

INTERPANEL

D

4th Floor

GND 24VAC

GND

24VAC

GND

24VAC

GND

24VAC

GND

485COMMIN

POWERIN

POWER&SWITCHABLECOMM

WATTMASTERCONTROLSINC.

YS102224REV0

MADEINUSAJRN

T

R

SH

TSHR

R

SH

T

TSHRTSHRTSHRTSHRTSHR TSHRTSHRTSHR

GND 24VAC

GND

24VAC

GND

24VACGND

24VAC

GND

485COMMIN POWERIN

POWER&SWITCHABLECOMM

WATTMASTERCONTROLSINC.

YS102224REV0

MADEINUSAJRN

T

R

SH

TSHR

R

SH

T

TSHRTSHRTSHRTSHRTSHR TSHRTSHRTSHR

GND 24VAC

GND

24VAC

GND

24VACGND

24VAC

GND

485COMMIN

POWERIN

POWER&SWITCHABLECOMM

WATTMASTERCONTROLSINC.

YS102224REV0

MADEINUSAJRN

T

R

SH

TSHR

R

SH

T

TSHRTSHRTSHRTSHRTSHR TSHRTSHRTSHR

GND 24VAC

GND

24VAC

GND

24VACGND

24VAC

GND

485COMMIN

POWERIN

POWER&SWITCHABLECOMM

WATTMASTERCONTROLSINC.

YS102224REV0

MADEINUSAJRN

T

R

SH

TSHR

R

SH

T

TSHRTSHRTSHRTSHRTSHR TSHRTSHRTSHR

GND 24VAC

GND

24VAC

GND

24VACGND

24VAC

GND

485COMMIN

POWERIN

POWER&SWITCHABLECOMM

WATTMASTERCONTROLSINC.

YS102224REV0

MADEINUSAJRN

T

R

SH

TSHR

R

SH

T

TSHRTSHRTSHRTSHRTSHR TSHRTSHRTSHR

TO WCCIII - MCD

SATIIIINAENCLOSURESAT 3D IN A ENCL OSURE

2-SATIIIINADUALENCLOSURE

SATIIIINAENCLOSURESAT 3D IN A ENCL OSURE

SATIIIINAENCLOSURE

SATIIIINAENCLOSURESAT 3D IN A ENCL OSURESAT 3D IN A ENC LOSURE

SAT III IN A ENCLOSURESAT III IN A ENCLOSURE

SAT 3D IN A ENCL OSURE

POWER & SWITCHABLE COMMBOARD (PL102224)

Recommended Communications Wiring

Figure 10-6: Typical WCC III System Communications Wiring – The recommended and preferred way

Wiring of the WCC III RS-485 communications loop as represented in Figure 10-6 is recommended for the following reasons:

1. “Wire Nuts” were not used.

2. The way the WCC III communications wiring was run is also recommended. Making a main WCC III communications trunk line and wiring from the basement to the 1st ﬂ oor, then to the 2nd ﬂ oor, then 3rd ﬂ oor, and then to the 4th ﬂ oor, makes logical sense. The location of the WCC III - MCD is not shown, but it could be

3. A Power and Switchable RS-485 Communication Board (PL102224) was used on a ﬂ oor-by-ﬂ oor basis. Use of this board will aid in initial startup and in future troubleshooting. This Power and Switchable RS-485 Communication Board (PL102224) has push buttons on each of the 8 communications connections going out from it. You can connect as many SAT III / SAT 3C/D/F controllers as you wish to each switchable connection, but remember that you can only isolate down to that loop of X number of SAT III controllers.

anywhere in the building as long as it is connected to the main trunk line. Also, lighting protection devices should be added on every ﬂ oor as a preventive measure.

WCC III Technical Guide

10-7