Table 6: Communication Bus and Supply Power Terminal Blocks, Functions, Ratings, Requirements, and
Cables
Recommended Cable
Type
2
Function, Electrical
Ratings/Requirements
Terminal Labels
Terminal Block/Port Label
0.8 mm to 1.0 mm
2
(20 to 18 AWG) 2-wire
24 VAC Power Supply - Hot
Supplies 20–30 VAC (Nominal
24 VAC)
HOT
24~
24 VAC Power Supply
Common
The -0 models
isolate this terminal from all
other commons.
The -1 models only isolate this
terminal from the FC bus
common.
COM
1
To determine wire size and cable lengths for cables other than the recommended cables, see
Table 5
.
2
The N2/FC Bus wiring recommendations in this table are for N2 bus communications at 9,600 baud. For more information,
refer to the
N2 Communications Bus Technical Bulletin (LIT-636018)
.
3
The MAP Gateway serves as a replacement for the BTCVT, which is no longer available for purchase, but continues to be
supported.
Setup and Adjustments
Important:
Electrostatic discharge can damage
controller components. Use proper
electrostatic discharge precautions during
installation, setup, and servicing to avoid
damaging the controller.
Setting the Device Address
Metasys
®
field controllers are subordinate devices on
N2 buses. Before operating field controllers on a bus,
you must set a valid and unique device address for each
controller on the bus.
You set a field controller’s device address by setting the
positions of the switches on the Device Address DIP
switch block at the top of the controller (
Figure 3
). Device
addresses 1 through 253 are the valid N2 addresses for
these N2 controllers.
Valid MS/TP addresses for wired controllers are 4 through
127. For wireless controllers, valid addresses are 132
through 255 (132 [132-128=4] through 255
[255-128=127]).
For wireless controllers, the address 120 through 127
are used by the ZigBee
®
Coordinator. This may cause
a smaller field device range.
If the VMA18 Series controller may eventually be
converted to MS/TP, use addresses 4 through 127 for a
wired VMA controller or addresses 132 through 253 for
a future wireless VMA controller, if possible. Using these
addresses simplifies the MS/TP conversion process.
Note: Metasys
field controllers ship with Switch 128 ON
and the remaining address switches OFF
rendering the controllers wired subordinate
devices, which do not operate on MS/TP buses,
but do not interfere with bus operation. Set a valid
and unique device address on the field controller
before applying power to the controller on the bus.
The DIP switch block (
Figure 14
) has eight switches
numbered 128, 64, 32, 16, 8, 4, 2, and 1. Switches 128
through 1 are device address switches.
Figure 14: Device Address Switches Set to 21
To set the device addresses on
Metasys
®
1. Set all of the switches on the field controller’s device
address DIP switch block (128 through 1) to OFF.
2. Set one or more of the eight address switches (128
through 1) to ON, so that the sum of the switch
numbers set to ON equals the intended device
address.
Set the highest number switch that is less than or
equal to the intended device address to ON. Then
continue setting lower numbered switches until the
total equals the intended address. For example, if the
intended device address is 21, set Switch 16 to ON
first, then set Switch 4 to ON, followed by Switch 1
(16+4+1=21). See
Figure 14
.
21
VMA1826/1832 VAV Controller Installation Instructions
