Note:
The MAP Gateway serves as a
replacement for the BTCVT, which is no longer
available for purchase, but continues to be
supported.
Figure 6: Pin number assignments for FC bus and
SA bus ports on equipment controllers
SA Bus port
The Sensor (SA Bus) port on the front of the
controller is an RJ-12, 6-position modular jack that
provides a connection for the MAP Gateway, BTCVT,
the VAV Balancing Tool, the DIS1710 local controller
display, specified network sensors, or other SA
Bus devices with RJ-12 plugs. When the CGM is
configured for N2 network communication, you
must download and commission the controller using
the SA Bus port.
Note:
The MAP Gateway serves as a
replacement for the BTCVT, which is no longer
available for purchase, but continues to be
supported.
The Sensor port is connected internally to the SA bus
terminal block. See Table 7 for more information.
The Sensor port pin assignment is shown in Figure 6.
Supply power terminal block
The 24 VAC supply power terminal block is a gray,
removable, 2-pin terminal plug that fits into a board-
mounted jack on the top right of the controller.
Wire the 24 VAC supply power wires from the
transformer to the HOT and COM terminals on
the terminal plug as shown in Figure 7. For more
information about the Supply Power Terminal Block,
see Table 7.
Figure 7: 24 VAC supply power terminal block
wiring
Table 4: Supply power terminal block wiring
Description
1
Supply power terminal block
2
Supply power terminal header
3
Wires from Johnson Controls 24 VAC, class 2 power
transformer
4
24 VAC (Orange wire)
5
COM (Brown wire)
Note:
The supply power wire colors may
be different on transformers from other
manufacturers. Refer to the transformer
manufacturer’s instructions and the project
installation drawings for wiring details.
Important:
Connect 24 VAC supply power
to the equipment controller and all other
network devices so that transformer phasing is
uniform across the network devices. Powering
network devices with uniform 24 VAC supply
power phasing reduces noise, interference,
and ground loop problems. The equipment
controller does not require an earth ground
connection.
Important:
Power wires must be less than 30
meters between controller and transformer
Terminal wiring guidelines, functions,
ratings, and requirements
This section provides further guidelines on input and
output wiring, maximum cable length versus load
current, and SA Bus and supply power wiring.
For information about removing a terminal block
from the controller, see
.
M4-CGM General Purpose Application Controllers Installation Guide
6
