Emerson Static Transfer Switch 15.2.11 RS-232 Interface Parameters, Maintenance Bypass, Options

Specifications

15.2.11 RS-232 Interface Parameters

The service terminal interface parameters are the following settings and cannot be changed.

Table 23 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

15.2.12 Maintenance Bypass

The Liebert 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 Liebert STS2 is furnished with key-interlocked maintenance bypass breakers to configure the bypass.

Liebert 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 main- tenance bypass.

See 10.4 - Maintenance Bypass on page 67 for instructions using the Color LCD Graphical Display unit and 14.2.3 - Maintenance Bypass on page 108 for instructions using the LED units.

15.2.13 Fuseless Design

All Liebert 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 Liebert STS2:

Optimized Transfer	LED Display
Redundant Output Breaker	Liebert IS-WEB485ADPT
Distribution Cabinet With I-Line Panelboard	Seismic Floor Stand - 18", 24", 30" and 36"
Input Junction Boxes and Cable	Export Crating
Comms Board w/Liebert SiteScan and Modem Interface	Remote Source Selection
Input Contact Isolator Board	Key Lockout Switch
Programmable Relay Board

See 6.0 - Options for more information.

116