Vertiv™ | Liebert® STS2/PDU
™
User Manual | Rev. 6 | 10/2017 87
12.0 COMMUNICATION INTERFACES
The Liebert STS2/PDU monitoring system offers several choices for communications.
The RS-232 terminal port is standard on all units. The port is inside the front door, to the left of the touchscreen
front panel mounting as shown in Figure 54. This port is primarily used as an alternate user interface to
configure, control and diagnose the system. Commands for the RS-232 port are shown in Table 14.
Several other communications options are also available. Those options are located in a Communications
compartment. See Figures 47 and 48 for the location of the communications options.
Connections to the communication ports are made by wiring to terminal boards located in the Communications
compartment. The communications options listed below reference the control wiring drawing for each option.
• Liebert IntelliSlot
™
Web/485 Card With Adapter (IS-WEB485ADPT) (optional) — the Liebert IS-WEB485ADPT provides
connectivity to any TCP/IP-based Ethernet network to allow the device to communicate with network management
systems (NMS) via SNMP. Events can be transmitted to the NMS to provide remote status monitoring, plus fault and alarm
detection. The Liebert IS-WEB485ADPT includes an RJ-45 port for an Ethernet connection, via Category 5 cable.
The Liebert IS-WEB485ADPT can also integrate the system with an existing Building Management System (BMS) or out-
of-band monitoring, using Modbus, a standard multi-drop protocol. The card has redundant communication paths that
make it possible to connect to a BMS using Modbus while simultaneously communicate to a NMS through SNMP.
See Figure 53 for more information on the Liebert IS-WEB485ADPT. If you have questions about the Liebert
IS-WEB485ADPT, refer to the user guide, SL-52615, available at Liebert’s Web site,
www.vertivco.com
• Input Contact Isolator (ICI) Board (optional) — provides an interface for up to eight user inputs. External messages and
alarms can be routed to the unit, via the ICI. See Configuring the Input Contact Isolator Settings on page 107 for
instructions on configuring the connections. See Figure 51 for wiring details.
• Programmable relay board (PRB) (optional) — up to two PRBs can be installed in the Liebert STS2/PDU to route Liebert
STS2/PDU events to external devices. See Configuring the Programmable Relay Board Settings on page 109 for default
settings and instructions for reconfiguring the relays. See Figure 50 for wiring details.
• Comms Board (optional) — includes a terminal block to provide a DTE connection to an external modem. This board also
provides a direct connection to a Liebert SiteScan terminal, via an RS-422.
Liebert SiteLink-12 or Liebert SiteLink-4 is required for Liebert SiteScan to communicate with the Liebert STS2/PDU. See
Figure 52 for wiring details.
Data link requirements are Full Duplex Asynchronous RS-232 format.
Communications options are also discussed in 6.0 - Options.
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