Liebert Static Transfer Switch 2, Installation, Operation & Maintenance Manual

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112 Specifications
15.2.11 RS-232 Interface Parameters
The service terminal interface parameters are the following settings and cannot be changed.
15.2.12 Maintenance Bypass
The STS2 is configured to allow the unit’s electronics to be bypassed to either input source for
maintenance without interruption of power to the load.
The STS2 is furnished with key-interlocked maintenance bypass breakers to configure the bypass.
STS2 units have all electronics isolated from the input, output, and bypass connections to allow
safe servicing of any components without access to hazardous voltages when the unit is in mainte-
nance bypass.
See 10.4 - Maintenance Bypass on page 61 for instructions using the Color LCD Graphical Dis-
play unit and 14.2.3 - Maintenance Bypass on page 104 for instructions using the LED units.
15.2.13 Fuseless Design
All STS2 units are fuseless and are UL rated for use with upstream circuit breakers only.
15.2.14 Options
The following options are available for the STS2:
See 6.0 - Options on page 18 for more information.
Table 25 RS-232 Settings
Parameter Setting
Interface RS-232 Using EIA Voltage Levels
Baud Rate 9600
Parity None
Number of Data Bits 8
Number of Stop Bits 1
Hardware Flow Control Off
Terminator <CR> <LF>
Handshaking Not supported
Structure Full duplex
Local Echo Off
• Redundant Output Breaker • Seismic Floor Stand
• Input Junction Boxes and Cable • Export Crating
• Comms Board w/SiteScan and Modem Interface • Internal Modem
• Input Contact Isolator Board • Remote Source Selection
• Programmable Relay Board • Key Lockout Switch
• Network Interface Card (NIC)