Reliable Controls SMART-Space Controller User Manual

BACNET NETWORK APPLICATIONS
24
 2012-2015 Reliable Controls Corporation
BACNET NETWORK APPLICATIONS
The SMART-Space Controller can only communicate on a BACnet network using the EIA-
485 electrical standard, and the BACnet MS/TP data-link. It is not possible to configure a
SMART-Space Controller to communicate using RCP protocol.
In accordance with the BACnet standard, the SMART-Space Controller can communicate
at 9600, 19200, 38400, and 76800 baud. The controller features auto-baud detection,
allowing it to sense the communication speed used by other devices on a MS/TP network
and automatically configure its own communication speed to match. If the communication
speed is changed on a functioning network that includes SMART-Space Controllers, the
controllers will sense the change and automatically reconfigure within 1 to 2 minutes.
The SMART-Space Controller is a BACnet slave device, meaning that it cannot request
information from other BACnet devices, it can only respond to requests for information.
Unlike BACnet master devices, slave devices do not take their turn holding the token. As
a result, slave devices do not consume as much bandwidth on an MS/TP network as
master devices.
For a SMART-Space Controller to be accessed by other BACnet devices, including
RC-Studio, a proxy device must be present on the same physical network. Possible proxy
devices are the MACH-ProCom™, MACH-ProSys
™
(firmware version 7.20, or later),
MACH-Pro1
™
, MACH-Pro2
™
, and X-Port-2 (firmware version 6.70, or later). Because these
devices have the slave proxy service enabled by default, no special configuration is
necessary. On power up, the proxy device locates any slave controllers on its connected
networks and automatically makes them available to the entire BACnet internetwork. Since
the X-Port-2 can be connected to any other MACH-System product (e.g., MACH-Global
™
,
MACH1
™
, MACH2
™
, etc.) these devices can be networked to the SSC without a MACH-
ProCom or MACH-ProSys. For further details on this subject, refer to the Slave Proxy
Configuration section of this manual.
Given that the SMART-Space Controllers use
1
/
8
load transceiver chips, the theoretical
maximum number of devices on a single network would be 256, with a maximum network
length of 4000 feet. Master devices, and devices with
1
/
4
load transceiver chips use more
network resources than a SMART-Space Controller. Table 3 is a rough guideline for the
maximum devices on an MS/TP network, assuming that all EIA-485 installation practices
recommended by Reliable Controls are followed.
TABLE 3: MAXIMUM SLAVES PER MS/TP NETWORK
Max # Masters Max # Slaves To t a l De v i c e s
1200 201
50 150 200
100 50 150
124 0 124

Reliable Controls SMART-Space Controller Specifications

General

Brand	Reliable Controls
Model	SMART-Space Controller
Category	Controller
Language	English