Rtu Open Communication Wiring Protocols - Carrier WeatherMaker 48TC 06 Installation Instructions Manual

J4-1 or J4-4 + 24 VDC
SUPPLY VOLTAGE
J4-2 or J4-5 (-)4 to 20 mA Current
LOOP OUTPUT TO RTU OPEN
4-20 VAC GND 0-5V
mA or or
VDC 0-10V
Fig. 73 — Duct Relative Humidity Sensor Typical
Wiring
To wire in the field:
• J5-8 = 24 VAC source for dry contact
• J5-7 = Signal input
Smoke Detector/Fire Shutdown (FSD) — This control is in-
stalled on 48TC units equipped with factory-installed Smoke
Detector(s). The smoke detector controller implements the unit
shutdown through its NC contact set connected to the unit's
CTB input. The FSD function is initiated via the smoke detec-
tor's Alarm NO contact set. The RTU Open controller commu-
nicates the smoke detector's tripped status to the BAS building
control. See Fig. 65 and 66, the RTU Open System Control
wiring schematics.
The Fire Shutdown Switch configuration, MENU>Con-
fig>Inputs>input 5, identifies the normally open status of this
input when there is no fire alarm.
Connecting Discrete Inputs
Filter Status — The filter status accessory is a field-
installed accessory. This accessory detects plugged filters.
When installing this accessory, the unit must be configured for
filter status by setting MENU>Config>Inputs>input 3, 5, 8, or
9 to Filter Status and normally open (N/O) or normally closed
(N/C). Input 8 or 9 is recommended for easy of installation. Re-
fer to Fig. 64-66 for wire terminations at J5.
Fan Status — The fan status accessory is a field-installed ac-
cessory. This accessory detects when the indoor fan is blowing
air. When installing this accessory, the unit must be configured
for fan status by setting MENU>Config>Inputs>input 3, 5, 8,
PROTOCOL
BACnet MS/TP (Master)
Modbus (Slave)
N2 Slave
LonWorks
LEGEND
DS — DIP Switch
NOTE: BACnet MS/TP SW3 example shown.
Baud Rate Selection
BAUD RATE
9,600
19,200
38,400
76,800
RELATIVE HUMIDITY SENSOR
(POLARIZED MALE CONNECTOR)
SPAN
ZERO
SW3 PROTOCOL SELECTION
DS8 DS7
Unused OFF
Unused OFF
Unused OFF
Unused ON
DS2 DS1
OFF OFF
ON OFF
OFF ON
ON ON
Fig. 74 — RTU Open SW3 Dip Switch Settings
or 9 to Fan Status and normally open (N/O) or normally closed
(N/C). Input 8 or 9 is recommended for easy of installation. Re-
fer to Fig. 64 and Fig. 65 or 66 for wire terminations at J5.
Remote Occupancy — The remote occupancy accessory is a
field-installed accessory. This accessory overrides the unoccu-
pied mode and puts the unit in occupied mode. When installing
this accessory, the unit must be configured for remote occupan-
cy by setting MENU>Config>Inputs>input 3, 5, 8, or 9 to
Remote Occupancy and normally open (N/O) or normally
closed (N/C).
Also set MENU>Schedules>occupancy source to DI on/off.
Input 8 or 9 is recommended for easy of installation.
Refer to Fig. 64 and Table 30 for wire terminations at J5.
Power Exhaust (output) — The relay used by the RTU Open
board to control power exhaust is a dry contact which means it
does not have 24vac. This 24vac must be connected to the relay
to allow it to operate the power exhaust relay in the PE acces-
sory. A 24vac source must be provided to J11-2 on the RTU
Open control board. This can be provided by the unit's trans-
former from various sources. The "R" terminal on the unit's
low voltage terminal board (LVTB) is a logical source. Refer to
Fig. 64-66 for wire terminations at J11.

RTU OPEN COMMUNICATION WIRING PROTOCOLS

General — Protocols are the communication languages spoken
by control devices. The main purpose of a protocol is to com-
municate information in the most efficient method possible.
Different protocols exist to provide different kinds of informa-
tion for different applications. In the BAS application, many
different protocols are used, depending on manufacturer. Proto-
cols do not change the function of a controller; just make the
front end user different.
The RTU Open can be set to communicate on four different
protocols: BACnet, Modbus, N2, and LonWorks. Switch 3
(SW3) on the board is used to set protocol and baud rate.
Switches 1 and 2 (SW1 and SW2) are used to set the board's
network address. See Fig. 74 and 75 for protocol switch set-
tings and address switches. The third party connection to the
RTU Open is through plug J19. See Fig. 76 for wiring.
NOTE: Power must be cycled after changing the SW1-3
switch settings.
Refer to the RTU Open v3 Integration Guide for more de-
tailed information on protocols third party wiring and network-
ing.
DS6 DS5 DS4
OFF OFF ON
OFF ON ON
OFF OFF ON
ON OFF ON
(OFF)
53
DS3 DS2
OFF Select Baud Select Baud
OFF Select Baud Select Baud
ON OFF
OFF OFF
COMM
OPTION
PORT
SET TO MSTP
UNUSED
(MASTER)
(ON)
PROTOCOL SELECTOR DIP SWITCHES
DS1
OFF
ON
SET TO
38.4k
BAUD