Siemens SINAUT ST7 - Connecting Several Md2 S with a DTE Via the RS485 Port

Mounting and Installation
6NH7811-0AA22 © Siemens AG 2002 All Rights Reserved
2-24 MD2 Modem (07/2002)
2.2.2 Connecting Several MD2s with a DTE via the RS485 Port
Several MD2 modems can be connected to a data terminal equipment (e.g. TIM)
through the RS485 interface. This type of connection is needed when several
dedicated lines come together at one DTE, in other words, when the connection
involves a star-shaped network. The following diagram shows an example of such
a configuration using standard components.
Fig. 2-13 Connecting several MD2s with a DTE (e.g. TIM) via RS485,
star-shaped junction of several dedicated lines
Cable
6NH7700-2AR60
RS485
RS485
RS485
Cable
6NH7700-2AR60
Cable
6NH7701-4DL
Cable
6NH7700-2AR60
RS485
LTOP2
4-wire
dedicated line
LTOP2
2-wire
dedicated line
#1
2-wire
dedicated line
#2
LTOP1
2-wire
dedicated line
LTOP1
overvoltage
protection
6NH9821-0BC11
or LTOP2
6NH9821-0BC12
The
terminating
resistor
needs to be
set on the
last plug!
DTE
MD2
TIM3V
TIM4
MD2MD2