50 VAV Controller—Variable Air Volume Controller
CBLPRO (AS-CBLPRO) is an interface device for use between a computer
running HVAC PRO for Windows and application specific controllers such
as the VAV Controller. It is used for data base downloading, uploading, or
commissioning via the Zone Bus communication port.
When used with a Zone Bus device, such as the VAV or ZT, the CBLPRO
is strictly an electrical interface between the serial RS-232 port of the
computer and the Zone Bus. CBLPRO operates on 24 VAC drawn from a
VAV over the wire used to make the Zone Bus connections. The data rate
on both the RS-232 and the Zone Bus is 1200 baud.
The connection to the RS-232 COM port of the computer is by means of a
DB9 or DB25 connector supplied with the CBLPRO. After connecting it,
make sure the CBLPRO is about a foot or more away from the computer
monitor and system unit.
IMPORTANT: In some cases, a computer monitor or PC will give off
electromagnetic noise that may disturb CBLPRO
communications. Therefore, do not position the
CBLPRO near the monitor or PC.
Zone Bus communications to the application specific controllers or ZT may
also be monitored with a CBLCON (AS-CBLCON-0). This device has a
red and green LED whose purposes are described in the following table.
Table 16: CBLCON LEDs
Red LED--
Power
Green LED--
COMM
Cause
OFF OFF
No power to VAV
ON OFF
Zone Bus wire open
ON ON
Zone Bus wire shorted to Common or 24 VAC, or
CBLCON-0 switch in download position
ON Blinking
Normal communications
CBLPRO
Description
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