Specifications

15.2.9RS-232 Port

The unit is equipped with an RS-232 port for connecting a terminal or PC. See Figure 28 for the port’s location.

See 12.1 - Using the RS-232 Port for instructions on using a PC terminal with the unit.

15.2.10Terminal 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.

Table 21 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

 

 

 

A DB9 male connector is added and connected parallel to the 6 position header. It is configured as DTE.

Table 22

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

 

 

 

 

115

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Image 123
Liebert 100-1000A user manual 15.2.9 RS-232 Port, Terminal Port Connections, MTA plug pinout, DB9 pinout