Emerson SiteLink-12E - Manual (Page 11)

Communication and Control Wiring
7
4.0 C
OMMUNICATION AND
C
ONTROL
W
IRING
NOTICE
Communication wiring must be performed in accordance with industry standards. All
methods, wiring and connections must comply with local and national codes.
Communication cables must not be kinked or otherwise damaged during installation. Kinked
cables must be replaced.
Communication cables must be properly supported every four feet (1.2m) or less.
4.1 IGM Communication
Liebert SiteLink-E uses the Information Gathering Module Network protocol to communicate to other
Liebert units over the RS-422 protocol. IGM is a point-to-point protocol, where one device connects
directly to another and only those two devices communicate with each other.
Liebert SiteLink-E modules have up to 12 IGM ports, depending on the model. The ports are along
the bottom of the module (see Figure 1).
NOTE
If shielded cable is used, connect the shield wire to earth (ground) at the Liebert equipment.
Do not ground the shield at the Liebert SiteLink-E.