Instruction manual

Interfaces
Linear Plus Series User Instruction Manual 27
Serial Interface COM 3 The 9-pole SUB-D connector (pin contacts) contains RS232 compatible signals.
NOTE: The interface COM 3 is electrically isolated from primary UPS circuits.
Fig. 16: Serial Interface RS232
Interface Slot COM The interface slot COM can be fitted with various optional interface cards.
Optional interface cards include:
• SNMP-adapter (ManageUPS
NET) for connecting the UPS to a network,
• Isolated contacts card.
Installation instructions are included with each card.
Table 12. RS232 Pins
Pin 2 RxD (receive RS232 compatible signals)
Pin 3 TxD (transmit RS232 compatible signals)
Pin 4 not used
Pin 7 not used
Pin 8 not used
Pin 1 not used
Pin 9 not used
Pin 6 not used
Pin 5 SGN (signal ground for pins)