Carrier B6 Series Specification page 7

N2-B6 Series - 8/23/23
RS-485 Terminator
The terminator on each end of the RS485 run is designed to match the electrical impedance characteristic of the twisted
pair wire, and will prevent signal echoes from corrupting the data on the line. The terminator should be enabled on BOTH
ends of the RS485 run. Short and medium length Modbus/485 runs can operate without the terminating resistor. Longer
runs may require the terminating resistors. But adding terminator dramatically increases power consumption.
Factory default setting is disabled terminator.
The B6 supplies this resistor on the main board, and it is chosen using a jumper at J4.
• 4 1-2: Terminator Disabled / OFF (default)
J4 2-3: Terminator Enabled / ON
•
RS-485 Driver Replacement
RS-485 lines in heavy industrial environments are sometimes subjected to magnetic disturbances causing sufficient
inducted power surges to damage the driver integrated circuit (IC). This IC (U6) has a socket on the circuit card for ease of
replacement in the field.
Relays Output
The B6 has three onboard programmable Single-Pole Double-Throw (SPDT) relays. These relays can be used to control
other equipment, such as fans, lights, horns, etc. eliminating the need for a separate controller.
Three terminal blocks (TB1, TB2 and TB3) are located on the main board. Each relay can be programmed individually.
Switching capability of each relay is:
A maximum resistive load at 30 VDC
•
0.3A maximum resistive load at 125VAC
•
Note for B6:
The B6 supports BACnet MS/TP protocol and can be networked to form a BACnet MS/TP network.
The B6 default baud rate is 38400bps.
Each B6 on the MS/TP network must have a unique BACnet MAC address and unique Device Instance Number (Object
ID).
• B6 valid MAC addresses are 0-127 for master node, 0-254 for slave node.
B6 default MAC address is 126.
•
• Default Device Instance Number (Object ID) is 4005.
When the B6 input power is AC, make sure all devices on the network use same rectifier circuit. The
B6M and Q6R both have full wave rectifier and half wave rectifier on board. You will damage devices if
Caution
you mix half wave and full wave rectifiers on the same AC source.
Avoid running communication wires or sensor input wires next to AC power wires or the relay output
wires. These can be sources of noise that can affect signal quality.
Tip
Catalog No. 11-808-788-01
Specifications subject to change without notice.
Toxic/Combustible Gas Transmitter B6
Installation and Operation
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