Hardware Installation
Dialup / Leased Line Modem
8
Connecting to AGM Universal Web Station (UWS)
To connect a DLM to a UWS Data Handler you will need a 9 pin female to 9 pin male straight
through cable.
1. Plug one end of the RS232 cable into one of the 9 pin male connectors on the UWS.
Select either “A” or “B” depending on which port will be used with the DLM.
2. Plug the other end of the RS232 cable into the 9 pin female D connector on top of the
DLM.
3. Power up both the UWS and DLM. If properly configured the “DTR”, “DSR”, “CTS”,
and “RTS” lights should be on. If these lights are not on check your cable
connections.
Connecting to a 3
rd
Party PLC
The DLM supports any PLC that uses a protocol based on 7 or 8 data bit asynchronous serial
communications. This includes ASCII Modbus, RTU Modbus, Allen-Bradley DF1 Half Duplex
and DNP3 protocols. You must have the appropriate RS232 interface installed. Consult with
your PLC manufacture on the RS232 interface to use.
You will need a cable to connect from your PLC to a Modem. If a cable of this type is not
available you will need a Null-Modem adapter and possibly a gender changer to connect your
PLC to the DLM. Null-Modem adapters and gender changers are typically available through
many computer, electronic or office supply stores.
1. Plug one end of the RS232 cable into your PLC. See your PLC documentation for
making this connection.
2. Plug the other end of the RS232 cable from the PLC into the 9 pin female D connector
on the top of the DLM.
3. Power up both the DLM and PLC. If properly configured the “DTR”, “DSR”, “CTS”,
and “RTS” lights should be on.
Some PLC’s may not provide full hardware handshaking. These PLC’s may still be
used with the DLM however you will need to disable the hardware handshaking and
DTR control in the DLM. Hardware handshaking may be disabled by connecting the
DLM to a computer then entering “AT&K0&W0”. DTR control may be disabled by
connecting to a computer and entering “AT&D0&W0”.