TOSHIBA
4.0
UPS Connections
4.4
Communication Interface (Cont'd)
4.4.2
RS-232C
The RS-232C serial communication interface is available through a DB9 female
connector located on the rear of the UPS (see Section 9.1 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:
Input voltage
Output voltage
Output current
Battery voltage
Input frequency
Output frequency
Utility power OK
Low battery voltage detected
UPS in BYPASS mode
UPS in NORMAL mode
Input and output frequency synchronized
UPS fault 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 m
ode)
4 - 6
4.4.3
UPS Shutdown (via RS-232C)
When the UPS is operating from its internal batteries, a shutdown order can be
sent to the UPS telling it to turn OFF after a user-specified amount of time. This
function can allow you to stop discharging the UPS batteries after an orderly
system shutdown has been completed. The UPS can be programmed to turn
OFF up to 8 minutes after the shutdown command is given. This command can
be cancelled before the specified time has elapsed.
Pin
I/O
Symbol
Description
1
This pin is not used
RS-232C Connector Pin Assignment
3
5
1
4
2
9
6
8
7
DB9 Female Connector
Outline
(facing connector)
2
RXD
Receive data
3
TXD
Transmit data
4
DTR
Data terminal ready
5
Signal ground
DSR
Data set ready
6
7
RTS
Request to send
8
CTS
Clear to send
9
This pin is not used
Input
Output
Output
Input
Output
Input
SG
Operating conditions
UPS operating status
(described as yes or no)
'Fault details
(described as occurred
or not occurred)
The connector pin assignment and female connector outline are illustrated below.
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