The DLM4100 is a compact dial-up modem designed and manufactured to operate in full industrial applications. It is powered with an input voltage range of +8V to +15VDC. A 120VAC to unregulated 12VDC wall transformer power supply has been provided (24VDC versions also available). The operating temperature range of this device is 0° to 70° C. The (ET) Extended Temperature model is rated at -40° to +85° C. Any device connected to the modem must be set for a 10-bit word such as: Data Bits Stop Bits Start Bits 8 1 1 7 1 1 7 2 1 Parity None Even/Odd None Connections Cable connections are all made on one end of the unit. The DB-9 female (see pinout below) on the left is for the RS-232 data.

Note: RS-485 and RS-422 models are also available The supplied wall transformer plugs into the barrel jack for supplying power to the unit. For alternate power methods, see barrel jack pinout below. The RJ-11 jack on the right is the telephone line connection. Only the center two lines are used. DB-9 for the RS-232 data port. The port is setup as a DCE device and the pins are: DB-9 Female Description Pin 1 Carrier Detect Pin 2 Data Out of modem RS-232 port Pin 3 Data Into modem RS-232 port Pin 4 N/C Pin 5 Ground Pin 6 N/C Pin 7 N/C Pin 8 N/C Pin 9 N/C The 12 VDC power jack plug for input power. 12VDC (P-5 Barrel Jack) Center Pin Outer Ring Indicators There are four LED’s displayed out the front panel for status and diagnostics they are as follows: (P) Power Red On indicates that the board is receiving power (C) Carrier Amber On indicates that a connection has been made to another DLM4100 ( I ) Data In Yellow On indicates that data is flowing into the serial port (O) Data Out Green On indicates that data is flowing out to the serial port Since the DLM4100 has been pre-configured at the factory for typical PLC to PC use, the only command strings required are for dialing and hanging up. The command instruction to be entered in either PC or PLC programmed for dial-up operation are listed below: Dial String: Command Mode (escape sequence): Hang up: ATDTx +++ ATH0

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