KWE Versatronik 502 Quick guide
Communication
Versatronik®502 & 502D
Communication Gateway
MODBUS
Document Applicable to:
Versatronik 502 & 502D NR2/Modbus
Versatronik 502 NR2/MODBUS P/N 704087
Versatronik 502D NR2/MODBUS P/N 704088
Applicable Controls
Vitocontrol-S, MW1 and MW2
Vitotronic 300-K, MW1B and MW2B
Vitotronic 100, GC1/GC1B
Vitotronic 300, GW2
Vitotronic 300, GW5B
Vitotronic 200, HO1
Vitodens 200 B2HA
Technical, Installation and Configuration Information
Cautionary Statement
The information presented in this document is
only to be used by those familiar with its
application and use.
IMPORTANT
Read and save these instructions for
future reference
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KWE P/N 394046 Versatronik 502 and 502D MODBUS Gateway V1.0 Feb 2014 Technical information subject to change without notice
About these instructions
Warnings draw your attention to
the presence of potential
hazards or important product
information.
Take note of all symbols and notations intended to draw attention to potential hazards or important product
information. These include “WARNING”, “CAUTION” and “IMPORTANT”. See below.
!
WARNING
!
Indicates an imminently hazardous
situation which, if not avoided,
could result in death, serious injury
or substantial product/property
damage.
CAUTION
!
Indicates an imminently hazardous
situation which, if not avoided,
may result in minor injury or
product/property damage.
IMPORTANT
Cautions draw your attention to
the presence of potential
hazards or important product
information
Helpful hints for installation,
operation or maintenance which
pertains to the product.
CAUTION
Static sensitive components may
be damaged by improper handling
or work within the control. Ensure
all possible measures are taken to
eliminate build-up of static
electricity.
Trademark Information
Echelon®, LON®,
LONWORKS®, i.LON®, LNS®,
LONMARK®, Neuron®, and the
LonUsers logo are trademarks
of Echelon Corporation
registered in the United States
and other countries.
Please visit:
www.echelon.com
Viessmann® and Vitotronic® are
trademarks of Viessmann Werke
GmbH & Co KG registered in the
United States and other
countries.
Please visit:
www.viessmann.ca
www.viessmann.us
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KWE P/N 394046 Versatronik 502 and 502D MODBUS Gateway V1.0 Feb 2014 Technical information subject to change without notice
Important Regulatory and Installation Requirements
Codes
The installation of this unit must
be in accordance with local
codes.
All electrical wiring is to be done
in accordance with the latest
edition of CSA C22,1 Part 1 and/
or local codes. In the U.S. use
the National Electrical Code
ANSI/NFPA 70.
The installing contractor must
comply with the Standard of
Controls and Safety Devices for
Automatically-fired Boilers, ANSI/
ASME CSD-1 where required by
the authority having jurisdiction.
Working on the equipment
The installation, adjustment,
service and maintenance of this
unit must be done by a licensed
professional heating contractor
or persons who are qualified and
experienced in the installation,
service, and maintenance of
similar products. There are no
user serviceable parts on this
control.
Power supply
Install power supply in
accordance with the regulation of
the authorities having jurisdiction
or in absence of such
requirements, in accordance with
National Codes.
Please carefully read this manual
prior to attempting installation.
Any warranty is null and void if
these instructions are not
followed.
The completeness and
functionality of field supplied
electrical controls and
components must be verified by
those installing the device
WARNING
!
More than one live circuit. See
wiring diagram in this manual.
Turn off power supply to control
and damper/blower before
servicing. Contact with live
electrical components can result in
serious injury or death
Purpose of Device and Operation
The Versatronik 502 gateway
provides a communication
translation between applicable
controls and DDC systems which
are capable of MODBUS
communications.
The Versatronik gateway may be
either part of a control panel or
stand-alone control device.
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KWE P/N 394046 Versatronik 502 and 502D MODBUS Gateway V1.0 Feb 2014 Technical information subject to change without notice
Versatronik 502
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KWE P/N 394046 Versatronik 502 and 502D MODBUS Gateway V1.0 Feb 2014 Technical information subject to change without notice
Mounting Versatronik Gateway—120VAC Unit
2
3
Installation
1. Mount Versatronik 502 Gateway in a
convenient location near the connected boiler
controls control. Remove cover by loosening
the two screws on either side of base to
release the cover.
2. Fasten base to wall using field-supplied
screws/fasteners.
3. Remove knockout and installed wire strain
relief or box connector. Removal of remaining
knockouts is required to make further
connections.
4. Once all of the 120VAC and low voltage
connections are complete and verified, reinstall
the cover from Step 1.
!
When extending wire there is the possibility of
exposure to electromagnetic interference. Avoid
running wires beside or near high voltage 120/240
VAC conductors. If proximity to high voltage
conductors cannot be avoided, use stranded, twisted
pair of shield design wire. Ensure that only one end of
the shielding is grounded.
Mounting Steps
1
4
1
WARNING
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KWE P/N 394046 Versatronik 502 and 502D MODBUS Gateway V1.0 Feb 2014 Technical information subject to change without notice
Mounting Versatronik Gateway—24VAC DIN Rail Unit
4
Installation
1. Mount Versatronik 502D Gateway onto
DIN rail within an enclosure in a
convenient location near the boiler
controls.
2. Make all the necessary connections
including the field supplied 24VAC power
connection.
WARNING
!
When extending wire there is the possibility of
exposure to electromagnetic interference. Avoid
running wires beside or near high voltage 120/240
VAC conductors. If proximity to high voltage
conductors cannot be avoided, use stranded, twisted
pair of shield design wire. Ensure that only one end of
the shielding is grounded.
Mounting Steps
1
!
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1 2 4 1. Control Connection RJ45
2. Paralleled BUS connection
3. Modbus connection A+ and B—
4. 24VAC Power Connection
Connection Overview
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KWE P/N 394046 Versatronik 502 and 502D MODBUS Gateway V1.0 Feb 2014 Technical information subject to change without notice
Versatronik 502 Dial Setting Overview
Rotary Dial Setting
1
Setting Overview
1. The rotary dial setting on the Versatronik
Gateways provides addressing information for
systems that may utilize a number of
Versatronik Gateways.
It is not required to make adjustments to the
rotary dial setting. It should be left in the
factory default position setting of 0.
Modbus Applications
The Modbus device address can be set to either
88 or 1 through 9. The addressing can be
accomplished with the rotary dial labelled
“Address” on the PCB.
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Rotary Switch Position Modbus Address
0 88
1-9 1-9
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1
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KWE P/N 394046 Versatronik 502 and 502D MODBUS Gateway V1.0 Feb 2014 Technical information subject to change without notice
1 Refer to manual specific to
boiler control. Ensure necessary
LON communication card
installed.
1 Control showing location of
LON card and its location
within.
2 A 3’/91cm CAT-5 cable is
supplied with the gateway.
The RJ45 is plugged into the
control and terminates into
the RJ45 socket inside of the
Versatronik 502 gateway.
3 Versatronik 502 gateway.
4 Modbus wiring connections
5 Plug-in power cord for
120VAC Versatronik 502
gateways.
Connection Overview
Connection Overview—120VAC
Communication connections—Vitotronic 100, GC1 or 300, GW2
Modbus
2
4
3
!"
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Modbus connections
120VAC
6
Modbus Wiring Connections
(RS-485 Network)
COM 1 terminals A and B are used. It is to
be noted that the A/B naming convention
may differ across manufacturers.
A=(+) non-inverting
B=(—) inverting
Termination and Bias:
This device does not have a termination re-
sistor installed. There are two weak
(4.7Kohm) pull up/down resistors located
on the lines to maintain a bias.
Modbus Wiring Connections
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KWE P/N 394046 Versatronik 502 and 502D MODBUS Gateway V1.0 Feb 2014 Technical information subject to change without notice
1
Connection Overview—24VAC
Communication connections—Vitotronic 100, GC1 or 300, GW2
Modbus
Modbus communications
!
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24VAC
5
Refer to manual specific to
boiler/system control. Ensure
necessary LON communication
card installed.
1 Control showing location of
LON card and its location
within.
2 A 3’/91cm CAT-5 cable is
supplied with the gateway.
The RJ45 is plugged into the
control and terminates into
the RJ45 socket inside of the
Versatronik 502 gateway.
3 Versatronik 502 gateway.
4 Field wiring for Modbus
connection to terminals A
and B.
5 Field supplied 24VAC power
supply for gateway.
Connection Overview
2
4
3
Modbus Wiring Connections
(RS-485 Network)
COM 1 terminals A and B are used. It is to
be noted that the A/B naming convention
may differ across manufacturers.
A=(+) non-inverting
B=(—) inverting
Termination and Bias:
This device does not have a termination re-
sistor installed. There are two weak
(4.7Kohm) pull up/down resistors located
on the lines to maintain a bias.
Modbus Wiring Connections
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KWE P/N 394046 Versatronik 502 and 502D MODBUS Gateway V1.0 Feb 2014 Technical information subject to change without notice
3
Connection Overview—120VAC
Communication connections—Vitocontrol-S, CT3/VD2A
Modbus
!"
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&
+
Modbus
communications
120VAC
4
Refer to manual specific to boiler/
system control. Ensure necessary LON
communication card installed.
1 A 3’/91cm CAT-5 cable is supplied
with the gateway. The RJ45 is
plugged into the control and
terminates into the RJ45 socket
inside of the Versatronik 502
gateway.
Vitocontrol-S will need LON card
installed.
2 Versatronik 502 gateway.
3 Field wiring for Modbus connection
to terminals A and B.
4 Plug-in power cord for 120VAC
Versatronik 502 gateways.
Connection Overview
1
2
Modbus Wiring Connections
(RS-485 Network)
COM 1 terminals A and B are used. It is
to be noted that the A/B naming conven-
tion may differ across manufacturers.
A=(+) non-inverting
B=(—) inverting
Termination and Bias:
This device does not have a termination
resistor installed. There are two weak
(4.7Kohm) pull up/down resistors located
on the lines to maintain a bias.
Modbus Wiring Connections
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KWE P/N 394046 Versatronik 502 and 502D MODBUS Gateway V1.0 Feb 2014 Technical information subject to change without notice
Connection Overview—24VAC
Communication connections—Vitocontrol-S, CT3/VD2A
Modbus
Modbus 2-Wire connection
terminals A and B
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24VAC
4
Refer to manual specific to boiler
control. Ensure necessary LON
communication card installed.
1 A 3’/91cm CAT-5 cable is supplied
with the gateway. The RJ45 is
plugged into the control and
terminates into the RJ45 socket
inside of the Versatronik 502
gateway.
2 Versatronik 502 gateway.
3 Field wiring for Modbus connection
to terminals A and B.
4 Field supplied 24VAC power supply
for gateway.
Connection Overview
1
3
2
Modbus Wiring Connections
(RS-485 Network)
COM 1 terminals A and B are used. It is
to be noted that the A/B naming conven-
tion may differ across manufacturers.
A=(+) non-inverting
B=(—) inverting
Termination and Bias:
This device does not have a termination
resistor installed. There are two weak
(4.7Kohm) pull up/down resistors located
on the lines to maintain a bias.
Modbus Wiring Connections
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KWE P/N 394046 Versatronik 502 and 502D MODBUS Gateway V1.0 Feb 2014 Technical information subject to change without notice
Connection Overview—120VAC
Communication connections—Vitocontrol-S, MW2 for Vitodens 200, WB2B
Modbus
145KMK
145KMK
!"
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&
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Modbus
connection
120VAC
4
Refer to manual specific to boiler
control. Ensure necessary LON
communication card installed.
1 A 3’/91cm CAT-5 cable is supplied
with the gateway. The RJ45 is
plugged into the control and
terminates into the RJ45 socket
inside of the Versatronik 502
gateway.
Communication card required for
Vitocontrol-S, MW2 for Vitodens
WB2B boilers.
2 Versatronik 502 gateway.
3 Field wiring for Modbus connection
to terminals A and B.
4 Plug-in power cord for 120VAC
Versatronik 502 gateways.
Connection Overview
3
2
1
Modbus Wiring Connections (RS-485 Network)
COM 1 terminals A and B are used. It is to be
noted that the A/B naming convention may differ
across manufacturers.
A=(+) non-inverting
B=(—) inverting
Termination and Bias:
This device does not have a termination resistor
installed. There are two weak (4.7Kohm) pull up/
down resistors located on the lines to maintain a
bias.
Modbus Wiring Connections
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KWE P/N 394046 Versatronik 502 and 502D MODBUS Gateway V1.0 Feb 2014 Technical information subject to change without notice
Connection Overview—120VAC
Communication connections—Vitocontrol-S, MW2 for Vitodens 200, WB2B
Modbus
145KMK
145KMK
Modbus
Connection
!
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24VAC
4
Refer to manual specific to boiler
control. Ensure necessary LON
communication card installed.
1 A 3’/91cm CAT-5 cable is supplied
with the gateway. The RJ45 is
plugged into the control and
terminates into the RJ45 socket
inside of the Versatronik 502
gateway.
2 Versatronik 502 gateway.
3 Field wiring for Modbus connection
to terminals A and B.
4 Field supplied 24VAC power supply
for gateway.
Connection Overview
2
3
1
Modbus Wiring Connections (RS-485 Network)
COM 1 terminals A and B are used. It is to be
noted that the A/B naming convention may differ
across manufacturers.
A=(+) non-inverting
B=(—) inverting
Termination and Bias:
This device does not have a termination resistor
installed. There are two weak (4.7Kohm) pull up/
down resistors located on the lines to maintain a
bias.
Modbus Wiring Connections
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KWE P/N 394046 Versatronik 502 and 502D MODBUS Gateway V1.0 Feb 2014 Technical information subject to change without notice
Connection Overview—120VAC
Communication connections—Vitodens 200, WB2B, HO1
Modbus
!"
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Modbus
connection
120VAC
4
Refer to manual specific to
boiler control. Ensure necessary
LON communication card
installed.
1 A 3’/91cm CAT-5 cable is
supplied with the gateway.
The RJ45 is plugged into the
control and terminates into
the RJ45 socket inside of the
Versatronik 502 gateway.
2 Versatronik 502 gateway.
3 Field wiring for Modbus
connection to terminals A
and B.
4 Plug-in power cord for
120VAC Versatronik 502
gateways.
5 Refer to boiler manual with
respect to installing LON
communications card inside
of boiler control.
Connection Overview
2
1
3
5
Modbus Wiring Connections
(RS-485 Network)
COM 1 terminals A and B are used. It is
to be noted that the A/B naming con-
vention may differ across manufactur-
ers.
A=(+) non-inverting
B=(—) inverting
Termination and Bias:
This device does not have a termina-
tion resistor installed. There are two
weak (4.7Kohm) pull up/down resistors
located on the lines to maintain a bias.
Modbus Wiring Connections
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KWE P/N 394046 Versatronik 502 and 502D MODBUS Gateway V1.0 Feb 2014 Technical information subject to change without notice
Connection Overview—24VAC
Communication connections—Vitodens 200, WB2B, HO1
Modbus
Modbus
Connection
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24VAC
4
Refer to manual specific to
boiler control. Ensure necessary
LON communication card
installed.
1 A 3’/91cm CAT-5 cable is
supplied with the gateway.
The RJ45 is plugged into the
control and terminates into
the RJ45 socket inside of the
Versatronik 502 gateway.
2 Versatronik 502 gateway.
3 Field wiring for Modbus
connection to terminals A
and B.
4 Field supplied 24VAC power
supply for Versatronik
gateway.
5 Refer to boiler manual with
respect to installing LON
communications card inside
of boiler control.
Connection Overview
5
1
2
3
Modbus Wiring Connections
(RS-485 Network)
COM 1 terminals A and B are used. It is
to be noted that the A/B naming con-
vention may differ across manufactur-
ers.
A=(+) non-inverting
B=(—) inverting
Termination and Bias:
This device does not have a termina-
tion resistor installed. There are two
weak (4.7Kohm) pull up/down resistors
located on the lines to maintain a bias.
Modbus Wiring Connections
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KWE P/N 394046 Versatronik 502 and 502D MODBUS Gateway V1.0 Feb 2014 Technical information subject to change without notice
Update Participant List for Vitocontrol-S, Cascade Control
Participant Update
This is to be carried out after all
the communication connections
have been completed and the
Vitocontrol-S, is coded as the
error manager.
Requirements:
Vitocontrol-S, must be coded as
the error manager (default).
Refer to the Vitocontrol-S manual
address 79:01.
The LON participant number
must be assigned in each of the
Versatronik 502 gateway units.
Refer to the rotary dial setting
and ensure there are no
duplicates.
Press the OK and lined Menu
button simultaneously to bring
up the Service menu option and
press OK.
Arrow down to Service
Functions and press OK.
When in the Service Functions
screen, ensure Subscriber
Check is highlighted. Arrow up
or down to highlight if not and
press OK.
Arrow down to Delete List? and
press OK.
The LON Participant information
will be updated as to the boiler
controls and any other
Versatronik LON devices.
Note:
Re-entering the Subscriber Check
too early will result in the screen
showing No Subscriber. Continue
Service
Diagnosis
Actuator
Coding Level 1
Fault History
Service Functions
Terminate Service?
Service Functions
Participant Check
Service PIN
Participant Check
Subscriber 1
Subscriber 3
Subscriber 4
Delete List?
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KWE P/N 394046 Versatronik 502 and 502D MODBUS Gateway V1.0 Feb 2014 Technical information subject to change without notice
Participant Check Vitocontrol-S, Cascade Control
Participant Check
The participant check is used to
confirm communication between
the boiler controls and the
Vitocontrol-S, system control.
Requirements:
Vitocontrol-S, must be coded as
the error manager (default).
Refer to the Vitocontrol-S manual
address 79:01. The LON
participant number must be
assigned in each of the
Versatronik 502 gateway units.
Refer to the rotary dial setting
and ensure there are no
duplicates.
1. Press the OK and Menu
buttons simultaneously for
approximately 2 seconds. This
will allow the Service screen
to appear.
2. With the arrow down button,
select the Service Functions
menu option.
3. Select Subscriber Check if
not already highlighted and
press OK.
4. With the arrow up or down
buttons, select a subscriber
and press OK. The screen with
show the check is active and
will report back if it is okay or
not.
5. If the check was successful,
select a different user by
using the arrow up or down
buttons. Once selected press
OK and repeat the same
procedure as outlined in point
4.
6. To exit the subscriber check,
press the return button .
Rotary Switch Position Participant Value
0 55
1 56
2 57
3 58
4 59
5 60
6 61
7 62
Service
Diagnosis
Actuator
Coding Level 1
Fault History
Service Functions
Terminate Service?
Service Functions
Participant Check
Service PIN
Participant Check
Subscriber 1
Subscriber 3
Subscriber 4
Delete List?
OK
KWE P/N 394046 Versatronik 502 and 502D MODBUS Gateway V1.0 Feb 2014 Technical information subject to change without notice
Overview:
Wiring
RS-485 Network
COM1 terminals A and B are used.
The A and B naming convention may differ across
manufacturers.
Refer to individual wiring/installation pages in this
manual.
A=(+) non-inverting
B=(—) inverting
Termination and Bias
This device does not have a termination
resistor installed
There are two 4.7kohm pull up/down
resistors located on the lines to maintain
bias.
LED Operation
LED2 will blink every time a Modbus request is
seen on the network
Modbus Information
Modbus Communication
Configuration Settings
The gateway is a Modbus slave and all
communication has to be initiated by a master.
To set up successful communication with the
gateway all connection parameters have to be
set correctly to the following: 9600 8-N-1 RTU.
Mode RTU
Baud Rate 9600bps
Data Bits/Length 8
Parity None
Stop bits 1
Address/Device ID 88, 1-9
Trouble-Shooting
Problem: Not getting a response from the
gateway device
Ensure the connection is set to 9600 8-N-1
Check the rotary dial switch for the device
addressing and it not in between dial
settings
Ensure the communication cables match
their polarity
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KWE P/N 394046 Versatronik 502 and 502D MODBUS Gateway V1.0 Feb 2014 Technical information subject to change without notice
Modbus Information
Registers
This device considers Holding Registers and
Input Registers Identical; the same data will
be found in either.
Holding Register 1 begins at address 40001.
Registers 1 to 23 are stored internally in
EEPROM and will be remembered during
power cycle.
Do not read more than 40 Registers
simultaneously, and do not exceed address
78 or an exception response will be
produced.
Coil and Input Status are not used on this
device.
Holding Register Description Notes Units Writeable
1 (40001) Boiler 1 LON Address (Configured Value must be set during
commissioning) 1..99 N/A Writeable
2Boiler 2 LON Address (Configured Value must be set during
commissioning) 1..99 N/A Writeable
3Boiler 3 LON Address (Configured Value must be set during
commissioning) 1..99 N/A Writeable
4Boiler 4 LON Address (Configured Value must be set during
commissioning) 1..99 N/A Writeable
5Zone/Cascade/Boiler LON Address (Configured Value must be set
during commissioning) 1..99 N/A Writeable
6Number of Zones on the Zone/Cascade/Boiler (Configured Value must
be set during commissioning) 1..3 N/A Writeable
7Zone/Cascade/Boiler DHW Writeable Set-Point °C/°F Writeable
8Zone/Cascade/Boiler Zone A1 Writeable Curve Shift °K Writeable
9Zone/Cascade/Boiler Zone A1 Writeable Curve Slope 0.1 Res. N/A Writeable
10 Zone/Cascade/Boiler Zone A1 Writeable Curve Room Temp. Normal °C/°F Writeable
11 Zone/Cascade/Boiler Zone A1 Writeable Curve Room Temp. Reduce °C/°F Writeable
12 Zone/Cascade/Boiler Zone A1 Writeable Supply Set-Point °C/°F Writeable
13 Zone/Cascade/Boiler Zone M2 Writeable Curve Shift °K Writeable
14 Zone/Cascade/Boiler Zone M2 Writeable Curve Slope 0.1 Res. N/A Writeable
15 Zone/Cascade/Boiler Zone M2 Writeable Curve Room Temp. Normal °C/°F Writeable
16 Zone/Cascade/Boiler Zone M2 Writeable Curve Room Temp. Reduce °C/°F Writeable
17 Zone/Cascade/Boiler Zone M2 Writeable Supply Set-Point °C/°F Writeable
18 Zone/Cascade/Boiler Zone M3 Writeable Curve Shift °K Writeable
Important Configuration Settings
Holding Register Point Description Details
1Boiler 1 LON Address Participant # / Node ID (Address 77)
Default 1 -4 for Vitotronic 100 controls
Rotary Dial Position for KK10LON and KW10B
Add 100 (101 - 104) for KK10LON control
Add 200 (201 - 204) for KW10B control
2Boiler 2 LON Address
3Boiler 3 LON Address
4Boiler 4 LON Address
5Zone/Cascade/Boiler
LON Address Participant # of cascade/zone control
Default 5 for Vitotronic 300 control
Add 200 (205) for MW2 control (for use with WB2B boiler over KM-BUS)
6Number of Zones on the
Zone/Cascade/Boiler Number of zones on the cascade/zone control. Including the common supply
zone (A1). Set 0 if no cascade or 1 through 3 for number of zones.
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KWE P/N 394046 Versatronik 502 and 502D MODBUS Gateway V1.0 Feb 2014 Technical information subject to change without notice
Modbus Information
19 Zone/Cascade/Boiler Zone M3 Writeable Curve Slope 0.1 Resolution N/A Writeable
20 Zone/Cascade/Boiler Zone M3 Writeable Curve Room
Temp. Normal °C/°F Writeable
21 Zone/Cascade/Boiler Zone M3 Writeable Curve Room
Temp. Reduce °C/°F Writeable
22 Zone/Cascade/Boiler Zone M3 Writeable Supply Set-Point °C/°F Writeable
23 Units (0-Celsius, 1-Fahrenheit) N/A
24 Not used
25 Boiler 1 State % Read-Only
26 Boiler 2 State % Read-Only
27 Boiler 3 State % Read-Only
28 Boiler 4 State % Read-Only
29 Not used
30 Boiler 1 actual temperature °C/°F Read-Only
31 Boiler 1 actual return temperature sensor 1 °C/°F Read-Only
32 Boiler 1 actual return temperature sensor 2 °C/°F Read-Only
33 Boiler 1 flue gas actual temperature °C/°F Read-Only
34 Boiler 1 fault code (Appendix A) N/A Read-Only
35 Boiler 1 relay state (Appendix B) Unsigned Int N/A Read-Only
36 Boiler 2 actual temperature °C/°F Read-Only
37 Boiler 2 actual return temperature sensor 1 °C/°F Read-Only
38 Boiler 2 actual return temperature sensor 2 °C/°F Read-Only
39 Boiler 2 flue gas actual temperature °C/°F Read-Only
40 Boiler 2 fault code (Appendix A) N/A Read-Only
41 Boiler 2 relay state (Appendix B) Unsigned Int N/A Read-Only
42 Boiler 3 actual temperature °C/°F Read-Only
43 Boiler 3 actual return temperature sensor 1 °C/°F Read-Only
44 Boiler 3 actual return temperature sensor 2 °C/°F Read-Only
45 Boiler 3 flue gas actual temperature °C/°F Read-Only
46 Boiler 3 fault code (Appendix A) N/A Read-Only
47 Boiler 3 relay state (Appendix B) Unsigned Int N/A Read-Only
48 Boiler 4 actual temperature °C/°F Read-Only
49 Boiler 4 actual return temperature sensor 1 °C/°F Read-Only
50 Boiler 4 actual return temperature sensor 2 °C/°F Read-Only
51 Boiler 4 flue gas actual temperature °C/°F Read-Only
52 Boiler 4 fault code (Appendix A) N/A Read-Only
53 Boiler 4 relay state (Appendix B) Unsigned Int N/A Read-Only
54 Zone/Cascade/Boiler Outdoor temperature °C/°F Read-Only
55 Zone/Cascade/Boiler Relay State (Appendix B) Unsigned Int N/A Read-Only
56 Zone/Cascade/Boiler Fault Code (Appendix A) N/A Read-Only
57 Zone/Cascade/Boiler DHW Set-Point °C/°F Read-Only
58 Zone/Cascade/Boiler DHW Actual Temperature °C/°F Read-Only
59 Zone/Cascade/Boiler Zone A1 Supply Set-Point °C/°F Read-Only
60 Zone/Cascade/Boiler Zone A1 Supply Actual Temperature °C/°F Read-Only
61 Zone/Cascade/Boiler Zone A1 Actual Return Temperature °C/°F Read-Only
Holding Register Description Notes Units Writeable
Continued
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5
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