twisted shielded cable. For more information, refer to the MS/TP Bus Cable Recommendations
section of the Verasys BACnet MS/TP Communications Technical Bulletin (LIT-12012362).
• Wire the RS485 +, -, and COM pins. Do not connect to the PWR pin.
Important: If the SBH300 is at the end of an MS/TP bus segment, set the End-of-Line (FC
EOL) switch to ON. If the SBH300 is not at the end of an MS/TP bus segment, set the End-
of-Line (FC EOL) switch to OFF. If you use a shielded cable, do not connect the shield wire
to the SBH300. To daisy chain the SBH300, connect the shields using a wire nut or similar
connector.
Connecting a TMR coordinator
You can connect equipment over a MS/TP wireless network to the SBH300 with a TMR set to
coordinator mode. You can connect up to two TMRs in Coordinator Mode to the SBH300. The first
TMR connected to the System Bus of the SBH300 automatically resets to Coordinator Mode. When
you connect a second TMR to the SBH300, you must manually set the TMR to Coordinator Mode. For
more information about Coordinator Mode, refer to the Mode selection section of Verasys TMR Series
Wireless Router Installation Guide (LIT-12014167).
About this task:
To connect the TMRs to the SBH300, complete the following steps:
1. Connect one TMR to the System Bus RJ-12 port.
2. If the System Bus RJ-12 port is already in use, or to connect a second TMR, use the four-
terminal System Bus port.
Note: The SBH300 provides power for the TMR on pin 4 of the FC bus connector. If the
SBH300 is wired to other MS/TP devices, do not connect the cable’s shield wire to the
four-terminal System Bus port. Leave the shield disconnected, or wire-nut the shield
wires together and bypass the SBH300.
Note: If the System Bus starts at the SBH300, connect the shield to earth ground. If the
SBH is in the middle of the run, wire nut the shields together and bypass the SBH300.
Powering the SBH300
To power the SBH300, use one of the following power supplies:
• 24 VAC power supply.
• Johnson Controls 24 VDC power supply, see Accessories.
• Third-party 24 VDC power supply, see Technical specifications.
CAUTION
Risk of Property Damage.
Do not apply power to the system before checking all wiring connections. Short circuited or improperly
connected wires may result in permanent damage to the equipment.
9Verasys Smart Building Hub (SBH300) Installation Guide
Johnson Controls
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