Penn A5 Series Installation Guide

Using the RS485 output to communicate
with BACnet
You can optionally connect the A525 Fermentation
Controller to a supervisory controller through a BACnet
MS/TP bus for remote monitoring and programmability
within a building automation system (BAS).
The A525 Fermentation Controller uses the isolated
RS485 output on the BACnet expansion interface to
communicate with BACnet. See the following figure for
an example of the BACnet expansion interface on the
controller.
Figure 6: BACnet expansion interface on the A525
Fermentation Controller
Connect the network terminal block on the A525
Fermentation Controller to the other devices in a daisy-
chain configuration using three-wire twisted, shielded
cable.
The isolated cable shield drain (SHD) terminal on the
network terminal block splices the cable shields along the
daisy-chain. See the following figure for more information
about daisy-chain configurations.
Figure 7: Network devices in a daisy-chain
configuration
Table 4: Network devices in a daisy-chain
configuration callout table
Callout Description
1
Terminating device on the RS485 network
trunk
2
Daisy-chained devices on the RS485 network
trunk
3 Isolated shield connection terminal
4
To the next device on the RS485 network
trunk
Set each network device that connects to the end of a
daisy-chain network trunk as a terminating device. The
A525 Fermentation Controller contains an end-of-line
(EOL) switch.
When you set the switch to on, the controller becomes
a terminating device. See the following figure for more
information.
Figure 8: EOL switch positions on network devices in a
daisy-chain network trunk
A525 Fermentation Tank Controller Installation Guide6

Penn A5 Series Specifications

General

Brand	Penn
Model	A5 Series
Category	Controller
Language	English