Siemens SINAUT ST7 - 2 Mounting and Installation

© Siemens AG 2002 All Rights Reserved 6NH7811-0AA22
MD2 Modem (07/2002)
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Mounting and Installation
2.1 Design of the MD2 Modem...................................................................2-2
2.1.1 Front View of an MD2 with Closed Front Doors ...................................2-2
2.1.2 LED Display of the MD2.......................................................................2-3
2.1.3 Front View of an MD2 with Removed Front Doors...............................2-4
2.1.4 Pin Assignments for the RS232 and RS485 Ports ...............................2-5
2.1.5 Standard Cables for the RS232 and RS485 Ports ...............................2-6
2.1.6 View of the MD2 Modem from Above...................................................2-9
2.1.7 Settings for the DIL Switches Accessible from Above..........................2-9
2.1.8 View of the MD2 Modem from Below...................................................2-17
2.1.9 DIL Switch for Activating the RS232 or RS485 Port.............................2-18
2.1.10 DIL Switch for Activating Terminating Resistors (WAN).......................2-18
2.1.11 Pin Assignments on the RJ12 Western Socket....................................2-19
2.1.12 Standard Cable for the RJ12 Port ........................................................2-20
2.2 Connecting an MD2 to DTE, LTOP and Dedicated Line ......................2-21
2.2.1 Connecting an MD2 with a DTE via the RS232 Port ............................2-21
2.2.2 Connecting Several MD2s with a DTE via the RS485 Port ..................2-24
2.2.3 Connecting Two MD2s to Function as a Repeater...............................2-27
2.2.4 Transmission Speeds and Frequencies of the MD2 Modem................2-28
2.2.5 Signal Loss Values...............................................................................2-29
2.2.6 Maximum Range (km)..........................................................................2-29
2.2.7 Determination of the receive level........................................................2-31
2.3 LTOP Line Transformer with Overvoltage Protection...........................2-32
2.3.1 Design..................................................................................................2-32
2.3.2 Connecting the MD2 Modem................................................................2-34
2.4 Mounting ..............................................................................................2-37
2.4.1 Mounting on an S7-300 Mounting Rail .................................................2-37
2.4.2 Mounting on a Standard 35mm Mounting Rail .....................................2-38
2.4.3 Horizontal and Vertical Mounting .........................................................2-39
2.4.4 Connecting to the Power Supply..........................................................2-40
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