3-16
95-8533
18.2
Connector P10, Terminals 60, 61 & 62, Port 2–
RS-485 Modbus RTU Master/Slave
Configuration data downloaded into the
controller configures the serial interface
transmission baud rate, parity check for the
serial port, and Modbus device address.
Software selectable baud rates are 9600,19200,
38400, 57600, 115200 and 230400. Software
selectable parity is None, Odd, and Even. The
controller uses 8 data bits with 1 stop bit.
Port Pinout (3-position terminal block)
60 — A
61 — B
62 — GND
Serial Interface Board Jumpers
Jumper P25 – RS-485 Termination
Jumper, Port 2
1-2 Terminated 121 ohms (factory setting)
2-3 Unterminated
Transceiver input impedance: 68 kohm
Jumper P3 – RS-485 Ground Fault
Monitor, Port 2
1-2 Enabled
2-3 Disabled (factory setting)
Ethernet Interface Board Jumpers
Jumper P6 – RS-485 Termination Jumper,
Port 2
1-2 Terminated 121 ohms (factory setting)
2-3 Unterminated
Transceiver input impedance: 68 kohm
Jumper P5 – RS-485 Ground Fault
Monitor, Port 2
1-2 Enabled
2-3 Disabled (factory setting)
Use Port 2 to pass safety critical information
between controllers. Ensure that Ground Fault
Monitoring is enabled. User logic can pass all
alarm, trouble, and supervisory information
between the controllers. Watchdog timers
must be implemented in user logic to verify
the integrity of the SLC. Consult the local
authority having jurisdiction for annunciation
requirements.
CONTROLLER TO CONTROLLER
COMMUNICATION
Controller to Controller Communication
(SLC485) with Signaling Line Circuit
Classication Class B or X, per NFPA 72
To connect up to twelve controllers together
and be able to transfer safety information
between the controllers, the communication
link must be classified as a signaling line circuit
per NFPA 72. With the Serial Interface Board,
Port 2 (plug 10) is a RS-485 serial connection
that is ground fault monitored.
To meet the signaling line circuit (Class B or
Class X) requirements, the following must be
configured for correct operation:
• All controllers must have the same type
Interface Board (Ethernet or Serial)
installed.
CAUTION
When using the Ethernet Interface Board,
controllers communicating over P10, Port
2 - RS-485 are required to be located
within the same room or be wired in
conduit within 20 feet (6 meters) for
signalling line transient protection.
• The Termination jumper P28 must be
set to Terminate (position 1-2) on all
controllers.
• The Ground Fault Monitor jumper P29
must be set to Enabled (position 1-2) on all
controllers.
• For Class X, Connect terminals A (# 56) and
B (# 55) between the controllers. Connect
terminal A (# 60) and B (# 61) between
controllers using a different cable route.
Connect GND (# 54) to GND (# 62) on each
controller.
• For Class B, connect terminals A (terminal
number 60) and B (terminal number 61)
between the controllers. The GND (terminal
number 62) must not be connected.
See Figure 3-13A and 3-13B for wiring details.
Note 1: 56.7 kbps minimum and 115.2 kbps
maximum baud rate required for
proper communication.
Note 2: Consult the factory for configuration
set-up.
Note 3: Maximum SLC485 length over
copper not to exceed 1000 meters.
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