2 Control solutions
H-LINK II Specications
TCGB0106 rev.0 - 12/2014
2525
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2.3 H-LINK II Specications
2.3.1 Hardware characteristics
Elements Specications
Communication cable Twin wire, without polarity
Communication system Half-duplex
Communication method Asynchronous
Transmission speed 9600 Bauds
Cable length Maximum 1000 m (5000 m if applied four PSC-5HR devices)
Either package units or water chillers only can be connected in an H-LINK communication line. Mixed connection of pack-
age units and water chillers is not permitted.
2.3.2 H-LINK II System
H-LINK II improves the characteristics of H-LINK I. The following table compares both systems and is valid for only 1000
meters of H-LINK line:
H-LINK I H-LINK II
Connectable outdoor units 16 64
Connectable indoor units 128 160
Units (outdoor and indoor) - 176
Maximum connectable devices 145 200
H-LINK II has a limit of 200 connected devices and a maximum number of 160 indoor units. The following limitation must
always be respected:
Outdoor units + Indoor units + other H-LINK devices ≤ 200
Therefore, in a case of 64 outdoor units connected to the same H-LINK, only 136 other elements may be connected (includ-
ing indoor units and control systems).
Number of
outdoor units
Maximum number of indoor
units and control systems
1 64
20 160
40 160
50 150
60 140
64 136
Restrictions when using PSC-5HR accessory
H-LINK line length could be up to 1000 meters. It can be increased up to 5000 meters using up to 4 PSC-5HR devices.
Each of them adds 1000 meters to the line, affecting the quantity of indoor units that can be connected to the same H-LINK.
Each H-LINK line repeater (PSC-5HR) counts as 16 indoor units. The following table summarizes the relation between the
quantity of PSC-5HR devices and the maximum number of indoor and outdoor units allowed in each case.
Number of PSC-5HR Maximum length of H-LINK Maximum number of indoor and outdoor units
0 1000 meters 176
1 2000 meters 160
2 3000 meters 144
3 4000 meters 128
4 5000 meters 112
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