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8.2 Serial port connection cable
RS485 cables connections are as follows:
UPS Side
Panel Side
9 Tx
2 Rx
7 Gnd
5 Gnd
6 Rx
3 Tx
8.3 Remote control/connection with a modem
The UPS connects to a phone line using its RS232 port and a modem. The operator connects to the UPS by
a computer containing TMON program and a modem. By this way a modem can be monitored using a tele-
phone line.
8.3.1 Hardware Configuration
All needs for modem connection is as follows:
•
PC with modem
•
WINDOWS 98
•
Available UPS control software
•
DUMP modem which is connected to UPS
The UPS, has AT command set to switch the DUMP modem into auto – answer mode. To perform this pro-
cess go to COMMAND MENU and then goto ENTER:MODEM INIT subitem and press enter button for 3 sec-
onds after installing the hardware. A short warning beep will be heard after pressing the button. Modem’s RX
and TX LEDs will start operating. Then, the modem will be configured to answer incoming calls. To test this,
call the phone number connected to the modem and hear modem’s voice.
8.3.2 Functioning Principle
The remote operator, by means of a PC and a modem device and using the remote connection function of the
control software, calls the UPS through the number to which this is connected.
The dumb modem device, connected to the UPS, will answer the call and convert the data coming from UPS
serial on the telephone line. This way all measures and controls allowed by the RS232 serial port can be car-
ried out.
8.3.3 Modem programming procedure
Smart modem (SM) is the one connected to PC, and (DUMB) DM is the one connected to the UPS. Standard
Hayes AT programming language is the suitable language for modems. In applications a modem which uses
AT command set must be selected.
The NULL modem connected to the UPS by connecting to a PC should be programmed, Connect the null
modem to the PC’s modem using a standard modem connection cable, then run Hyperterminal program and
send AT commend group to the modem, the AT command set used in configuration is given in the following
table: