Alpha Technologies
51
4
Communication
4.1
Wiring the RS–232 Port
The UPS’s front panel has a DB–9 female connector. When connected to a PC with Windows
3.1, 95/98, 2000, NT, XP or terminal emulation software, the unit can be remotely monitored,
controlled and calibrated with RS–232 ASCII commands.
Procedure:
Tips:
•
Use only fully shielded cables. A serial cable is available from Alpha Technologies.
•
PINS 1 to 6 are not connected to RS–232, PIN 7: Transmit, PIN 8: Receive, PIN 9: Ground. Use
three wire cables if only the RS–232 connections are used.
•
In Windows 3.1, click the Terminal icon. In Windows 95/98, 2000 and NT the path is Start/Pro-
grams/Accessories/Communications/HyperTerminal. For a tutorial on how to connect the unit with
Window’s HyperTerminal, see Section 4.2, “HyperTerminal Set Up.”
1
Connect a cable between the computer’s
port and the UPS’s port (Figure 4.1.1).
2
If you are not using HyperTerminal,
configure the communications parameters
to the values shown in the terminal set up
table (Figure 4.1.2).
RS–232 Wiring Finished
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TXD 7
RXD 8
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6
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8
9
Unit RS-232
Serial Connector
(9 Pin Female)
9 Pin PC
Serial Port
1
2
3
4
5
6
TXD 7
RXD 8
GND 9
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3 TXD
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7 GND
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25
Unit RS-232
Serial Connector
(9 Pin Female)
25 Pin PC
Serial Port
Figure 4.1.1
UPS-Computer Connection
Figure 4.1.2
Terminal Set Up Table
