Liebert STS2 - Manual (Page 127)

Specifications
119
14.2.9 RS-232 Port
The unit is equipped with an RS-232 port for connecting a terminal or PC. See Figure 55 for the
port’s location. See 12.1 - Using the RS-232 Port for instructions on using a PC terminal with the
unit.
14.2.10 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 1000VDC 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 26 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 27 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