Vertiv™ | Liebert
®
STS2
™
100-1000A, 50/60Hz User Manual | Rev. 12 | 11/2017 73
12.0 COMMUNICATION INTERFACES
The Liebert STS2 monitoring system offers several choices for communications.
The RS-232 terminal port is standard on all units. The port is located inside the front door, to the left of the
touchscreen/LED front panel mounting as shown in Figure 26. This port is primarily used as an alternate user
interface to configure, control, and diagnose the system, especially for systems that do not include the HMI
touchscreen. Commands for the RS-232 port are shown in Table 6.
Several other communications options are also available. Those options are located a Communications
compartment to the right of the touchscreen/LED front panel and are accessible when the front panel door is
open. See Figures 19 and 20 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 SNMP/Web/Modbus 485 card (optional) — the card provides connectivity to any TCP/IP-based Ethernet
network to allow the device to communicate with network management systems (NMS) via SNMP/Web(HTTP). Events can
be transmitted to the NMS to provide remote status monitoring, plus fault and alarm detection. The card includes an RJ-45
port for an Ethernet connection, via Category 5 cable.
The Liebert SNMP/Web/Modbus 485 card 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 communicating to an NMS through
SNMP/Web(HTTP).
See Figure 25 for more information on the Liebert SNMP/Web/Modbus 485 card. If you have questions about the card,
refer to the user guide, SL-52615, available at the Liebert 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 91 for instructions on configuring the connections. See
Figure 23 for wiring details.
• Programmable Relay Board (PRB) (optional) — up to two PRB’s can be installed in the Liebert STS2 to route Liebert STS2
events to external devices.
See Configuring the Programmable Relay Board Settings on page 92 for default settings and instructions for
reconfiguring the relays. See Figure 22 for wiring details.
• Comms Board (optional) — 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. See Figure 24 for wiring details.
Data link requirements are Full Duplex Asynchronous RS-232 format.
Communications options are also discussed in 6.0 - Options.
12.1 Using the RS-232 Port
The RS-232 port is configured with a baud rate of 9600 with 8 data bits, 1 stop bit, no parity, and no hardware
handshaking.
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