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RTU Open Controller System —
troller is factory-mounted in the 581J unit's main control box,
to the left of the CTB (see Fig. 42). Factory wiring is complet-
ed through harnesses connected to the CTB. Field-connections
for RTU Open controller sensors will be made at the Phoenix
connectors on the RTU Open board. The factory-installed RTU
Open controller includes the supply-air temperature (SAT) sen-
sor. The outdoor air temperature (OAT) sensor is included in
the FIOP/accessory EconoMi$er 2 package.
The RTU Open controller is an integrated component of the
Bryant rooftop unit. Its internal application programming
provides optimum performance and energy efficiency. RTU
Open enables the unit to run in 100% stand-alone control mode
or a Third Party Building Automation System (BAS). On-
board DIP switches allow to select your protocol (and baud
3-Volt
Lithium
Battery
LonWorks
Option Card
Port
J15
Example set for
BACnet MS/TP
and 76.8K baud
(1, 2, and 4 ON)
Recommended for all
P
o r
i-Vu Open installations
The RTU Open con-
J4
BO-1
BO-2
J13
J12
o t
c
l o
S
e
e l
t c
r o
*Remove
both for 0-5V
SPT (offset input)
Fig. 42 — RTU Open Multi-Protocol Controller Board
rate) of choice among the four most popular protocols in use
today: BACnet
1
, Modbus
Fig. 42.)
Refer to Table 21, RTU Open Controller Inputs and Outputs
for locations of all connections to the RTU Open controller
board. See Fig. 43 and 44 for wiring diagrams.
1. BACnet is a registered trademark of ASHRAE (American
Society of Heating, Refrigerating and Air-Conditioning Engi-
neers).
2. Modbus is a registered trademark of Schneider Electric.
3. LonWorks is a registered trademark of Echelon Corpora-
tion.
Board Power
J1
BO-3
BO-4
BO-5
J22
AO-2
GND
(2-10V)
J17
Network Comm
J19
J20
S
P
T
(
e t
m
p
n i
p
u
) t
B
A
C
SPT (common)
(LON connection J15)
36
2
, Johnson N2 and LonWorks
(AO-1)
0-10VDC
J3
J2
4-20mA
J5
J5
J22
VFD Output
BO-6
J11
BO-6
BO-7
(H) Humidimizer
BO-7
(Reversing Valve/High Speed Fan/Y3)
BO-8
BO-8
(Power Exhaust)
J14
n
e
, t
M
o
d
b
u
, s
r o
N
2
3
. (See
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