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6.0 UPS Control Interface
6.1 DB25 Connector Pinout
RS-232C serial communication and Dry Contacts are both standard features available
through a DB25 female connector located on the back panel of the UPS (see Section 9.1).
The RS-232C serial communication interface allows control of the UPS from a personal
computer running special Toshiba software. The computer is connected to the UPS
through a serial RS-232C communication port. The Dry Contact interface is available as
open or closed contacts. An adapter is available from Toshiba for splitting the RS-232C
and Dry Contact interfaces into two separate DB9 connectors. Contact Toshiba for more
information on this option. The following chart shows the pin assignments for the DB25
connector.
Pin Symbol Description
1 0V Supply used by Slide-In Options cards (-)
2 +9V Supply used by Slide-In Options cards (+)
3 RXD_UPS UPS receive line
4 TXD_UPS UPS transmit line
5 TXD_AUX Auxiliary transmit line
6 RXD_AUX Auxiliary receive line
7 (not used)
8 SNMPSIG1 SNMP option card function
9 RS_Common Common line for RS-232C communication
10 SNMPSIG2 SNMP option card function
11 DTR UPS data terminal ready
12 DSR UPS request to send
13 RTS UPS clear to send
14 CTS UPS data set ready
15 (not used)
16 Dry_Common Common line for Dry Contact signals
17 Backup_O Open during Battery Backup
18 Backup_C Closed during Battery Backup
19 Low_Battery Closed during Low Battery
20 Inverter Closed during On-Line mode
21 Bypass Closed during Bypass mode
22 Fault Closed during Fault
23 (not used)
24 SD_Signal Shutdown command signal line
25 SD_Common Shutdown command common line
RS-232C Serial Interface
Dry Contacts