Chapter 4 UCM Communication-Link Wiring
46 BMTW-SVN01F-EN
Table 7. UCMs Linked to BCU
Communication-Link
Ty p e
UCM Device
Standard Capacity BCU High Capacity BCU
Maximum
Devices per
Link
Maximum
Quantity
per BCU
Maximum
Devices per
Link
Maximum
Quantity
per BCU
Comm2 UCP1 3 3 3 6
Isolated Comm3 CSC 10 10 20 20
LCP* 4* 4* 8* 8*
PCM 15153030
RTA-RTW 5 5 10 10
Scroll chiller (CGA/CGW/CGAF) 5 5
10
â€
10
TCM 30306060
Trane Europe chiller 5 5 10 10
VariTrac II CCP 6 12 6 24
Voyager 16163232
Non-isolated Comm3 TRS
8
‡
8
‡
8
‡
8
‡
VAV I 63 126 63 189
Comm4 Horizon absorption chiller 5 5 10 10
IntelliPak 10 10 20 20
TUC 64 128 64 192
UCP2 5 5 10 10
UPCM 5 5 10 10
VAV II/III/IV 63 126 63 189
VAV wireless receiver 8 8 8 8
Voyager 16163232
Comm5 Tracer loop controller 1 1 1 1
Discharge air controller (DAC)*** 10 10 20 20
Tracer MP580 and Tracer MP581 con-
trollers
10 10 20 20
Space comfort controller (SCC)*** 120** 120** 120** 120**
Generic LonTalk
®
device (GLD)
20 20 40 40
N/A BCU I/O module 1 1 1 1
* Requires an LCP Supervisor on each link (where LCPs are connected) to act as an interface/translator.
â€
Some models of CGAF chillers are currently limited to addresses 49–54, which limits the maximum number of devices per link
to 6.
‡
The number of TRS panels supported in a BCU is a function of the number of binary and analog objects defined. Make sure that
the BCU is properly sized (refer to BAS-PRB005-EN, Building Control Unit Sizing for Version 13 Tracer Summit Systems). TRSs
must be configured on communication link 1. TRSs cannot coexist with other UCM types on the same communication link. The
non-isolated Comm3 link must be dedicated solely to the TRS interface and can be located only on communication link 1.
** A maximum of 60 devices per link can be accommodated. With a repeater, the maximum number is increased to 120.
*** For a complete list of controllers, see Chapter 5, Comm5 section.
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