Carrier 50HCQ04---12 - Manual (Page 11)

11
SW3 Protocol Selection
PROTOCOL DS8 DS7 DS6 DS5 DS4 DS3 DS2 DS1
BACnet MS/TP
(Master)
Unused OFF OFF OFF ON OFF Select Baud Select Baud
Modbus
(Slave)
Unused OFF OFF ON ON OFF Select Baud Select Baud
N2
(Slave)
Unused OFF OFF OFF ON ON OFF OFF
LonWorks Unused ON ON OFF ON OFF OFF ON
NOTE:
DS = Dip Switch
BACnet MS/TP SW3 example shown
Baud Rate Selections
BAUD RATE DS2 DS1
9600 OFF OFF
19,200 ON OFF
38,400 OFF ON
76,800 ON ON
C07166
Fig. 11 -- RTU--OPEN SW3 Dip Switch Settings
C10815
Fig. 12 -- RTU--OPEN Address Switches
C10816
Fig. 13 -- Network Wiring
Modbus
The RTU--OPEN module can speak the Modicon Modbus
RTU Protocol as described in the Modicon Modbus
Protocol Reference Guide, PI----MBUS----300 Rev. J. The
speed of a Modbus network can range from 9600 to 76.8K
baud. Physical Addresses can be set from 01 to 99.
Johnson N2
N2 is not a standard protocol, but one that was created by
Johnson Controls, Inc. that has been made open and
available to the public. The speed of N2 network is
limited to only 9600 baud. Physical Addresses can be set
from 01 to 99.
LonWorks
LonWorks is an open protocol that requires the use of
Echelon’s Neuron microprocessor to encode and decode
the LonWorks packets. In order to reduce the cost of
adding that hardware on every module, a separate
LonWorks Option Card (LON--OC) was designed to
connect to the RTU--OPEN.
This accessory card is needed for LonWorks and has to be
ordered and connected using the ribbon cable to plug J15.
The RTU--OPEN’s baud rate must be set to 38.4k to
communicate with the LON--OC. The address switches
(SW1 & SW2) are not used with LonWorks.