Johnson Controls METASYS ASC, Networking And Troubleshooting Manual

Page: 44 / 48

44 Introduction—ASC and N2 Bus Networking and Troubleshooting Guide
The AS-CBLPRO is an interface device for use between a PC or laptop
computer running HVAC PRO software and ASCs. It is used for data
base downloading, uploading, or commissioning via the Zone Bus
communication port. There are three models: the AS-CBLPRO-0
(Figure 19), AS-CBLPRO-1 (also Figure 19), and AS-CBLPRO-2
(Figure 20).
●
When used with a Zone Bus device, such as the AHU, UNT, VAV, or
ZT, the Cable Pro is strictly an electrical interface between the serial
RS-232 port of the computer and the Zone Bus. Cable Pro operates
on 24 VAC drawn from an ASC 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.
●
When used with the LCP, Cable Pro is an asynchronous-to-
synchronous converter as well as an electrical interface. The internal
microcontroller allows the RS-232 port to operate at 1200 baud while
the LCP side operates at 600 baud. The connection to the LCP is
made with a 4-pin connector. The Cable Pro needs an external
9-12 VDC/VAC @ 60 mA power transformer for LCP service port
communication (e.g., Radio Shack

12 VDC transformer kit
273-1652).
A DB9 or DB25 connector is used to connect the Cable Pro to the
computer’s RS-232 COM port. The connector is supplied with the
AS-CBLPRO-0 and -1 models, and permanently attached to the
AS-CBLPRO-2 model. After connecting it, make sure the Cable Pro is
about a foot or more away from the computer monitor and system unit. In
some cases, a computer monitor and system unit will give off
electromagnetic noise that may disturb Cable Pro communications.
Therefore, do not position the Cable Pro near the monitor or system unit.
CBLPRO-0
To ASC,
Zone Terminal,
Metastat
To Power
To LCP (12VDC)
Figure 19: Cable Pro Model AS-CBLPRO-0, -1
Cable Pro
Description