Xtreme Power Conversion Corporation
G90 Service Manual
Page 26
Uninterruptible Power Supply
APPENDIX I: COMMUNICATION
1. RS232 PORT
The RS232 provides proprietary command sequence for the computer to monitor the line and UPS status and to
control the UPS. The data format is listed as following:
BAUD RATE...............: 2400 bps
DATA LENGTH..........: 8 bits
STOP BIT....................: 1 bit
PARITY.......................: NONE
The interface configuration is indicated in figure VI-1 and the pin assignment and description are listed in the fol
-
lowing table.
PIN #
Description
I/O type
1,4,6,7,8,9
not connected
3
UPS RS232 receiver Rx from com
-
puter.
input
2
UPS RS232 transmitter to computer
output
5
GND
Note that, the computer will control information exchange by a query followed by <cr> (Character Return). UPS
will respond with information followed by a <cr> or action. All the information is provided in ASCII format.
2. USB PORT
The USB is compatible to USB2.0 specification, and implemented for customized HID and self-powered device. The
customized HID bi-directionally transfers the UPS protocol from USB to serial communication so that the monitor
software can support the 2 communication ports (USB & RS232) with less effort.
The USB connector is “B” receptacles, seeing the following figure VI-2. The signal definition of USB interface is
listed following table.
PIN#
SIGNAL
1
VBUS
2
D-
3
D+
4
GND
Figure VI-1 9 pins female D-type connector
Figure VI-2 USB "B" receptacles
