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TOSHIBA
16
UPS Connections
Communication Interfaces (Cont'd)
RS-232C
The RS-232C serial communication interface is available through a DB9 female connector
located on the back side of the UPS (see pages 45-46 for DB9 connector location). This
interface allows control of the UPS from a personal computer running special Toshiba
software. The computer and the UPS are connected through a serial RS-232C
communication port. The available data from the UPS, via the RS-232C communication link,
is shown below:
Operating Conditions
Input voltage
Output voltage
Output current
Battery voltage
Input frequency
Output frequency
UPS operating status
(described as ‘yes’ or ‘no’)
Utility power OK
Low battery voltage detected
UPS in BYPASS mode
UPS in NORMAL mode
Input and output frequency synchronized
UPS ‘Fault’ occurred
‘Fault’ details
(described as ‘occurred’ or ‘not occurred’)
DC bus overcurrent
DC bus overvoltage
DC bus undervoltage
Input overcurrent
Overheat
Overload being timed
Overload (allowable time exceeded)
Output overvoltage (during NORMAL mode)
Output undervoltage (during NORMAL mode)
The connector pin assignment and female connector outline are illustrated below.
RS-232C Connector Pin Assignment
Pin I/O Symbol Description
1 This pin is not used
2 Input RXD Receive data
3 Output TXD Transmit data
4 Output DTR Data terminal ready
5 SG Signal ground
6 Input DSR Data set ready
7 Output RTS Request to send
8 Input CTS Clear to send
9 This pin is not used
DB9 Female Connector Outline
(facing connector)
9 8 7 6
5 4 3 2 1