A Quick Look at the DLM4000 Industrial Dial-up/Leased Line Modem

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The Data-Linc DLM4000 is a stand-alone industrial use modem that communicates as either a dial-up or leased line device. It is capable of communication at speeds up to 28.8k baud, and responds to standard AT commands. The DLM4000 has a rugged steel housing with large mounting flanges for ease of installation.

To connect the DLM4000 to a PC or PLC use use a communication cable for your specific application. The modem connector pinout is as follows:

DLM4000 CONNECTOR PINOUT
DLM4000PIN NAME
PIN NAME
1PROTECT GNDSHIELD
2RXD INTXD OUT
3TXD OUTRXD IN
4RTSRTS OUT
5CTSCTS IN
6DSRDSR IN
7SIG GNDSIG GND
8CDDCD IN
20DTRDTR OUT

 

All connections to the DLM4000 are at the rear of the modem. Interface to the PLC/PC is through the DB-25 female connector, and the communication connection is made through the RJ11 jack.

LEDs displayed on the front of the modem for Carrier Detected, Transmit (Data Out), and Receive (Data In) provide confirmation of operation and diagnostic convienence. For an explanation of the remaining LED functions, please see the DLM4000 User´s Guide.

DLM4000 Front

DLM4000 Back

Configuring for leased line or dial-up is accomplished by the setting of a jumper on the modem board and through the AT command process. As the DLM4000 comes configured from the factory for each specific application, this is usually unecessary. If changing the configuration of the DLM4000 does become necessary, please refer to the DLM4000 User´s Guide for detailed instructions.

DLM4000 System Schematic

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