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

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Specifications 111
15.2.8 Color Graphical Display or LED Display
The display is located in the front of the unit. Front panel display is either an LCD touch screen dis-
play for monitoring and configuring the unit, or an LED panel to monitor the unit's status.
See Figure 31 on page 49 for a drawing of the touch screen display. See Figure 50 on page 100 for
the layout of the LED display.
15.2.9 RS-232 Port
The unit is equipped with an RS-232 port for connecting a terminal or PC.
See Figure 29 on page 47 for the port’s location.
See 12.1 - Using the RS-232 Port on page 70 for instructions on using a PC terminal with the
unit.
15.2.10 Terminal Port Connections
The system has an asynchronous serial port configured as Data Terminal Equipment for terminal
access only (half duplex). The CPU services the terminal port with no handshaking. The serial port
conforms to RS-232 levels with a data format of 9600 Baud, 1 start bit, 8 data bits, and no parity
bits. The serial port is 1000 Volt DC isolated (non-SELV) and ESD protected to 15kV air discharge.
The connector is a 6 Pin MTA plug with connections shown below.
A DB9 male connector is added and connected parallel to the 6 position header. It is configured as
DTE.
Table 23 MTA Plug Pinout
Pin Signal Name Function / Comments
1 ISO_GND Isolated service terminal ground
2 ISO_TXD Isolated service terminal transmit output
3 ISO_RXD Isolated service terminal receive input
4 NC No Connection
5 NC No Connection
6 NC No Connection
Table 24 DB9 Pinout
Pin Signal Name Function / Comments
1 NC No Connection
2 ISO_RXD Isolated service terminal transmit output
3 ISO_TXD Isolated service terminal receive input
4 NC No Connection
5 ISO_GND Isolated service terminal ground
6 NC No Connection
7 NC No Connection
8 NC No Connection
9 NC No Connection