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Installation and commissioning of the modems and routers
5.5 MD2 dedicated line modem
Note
Any TIM with an RS-485 port can be used, in other words, all TIM 4 types and the
TIM 4R-IE. The TIM 3V-IE variants only have an RS-232 interface. If necessary, a
commercially available RS-232/RS-485 converter would need to be used.
Note
Do not forget to activate the terminating resistor for the RS-485 bus on the last connector
using the slider switch.
The dedicated line is connected over the LTOP 1 or LTOP 2 overvoltage protection module.
The figure shows various options for connecting a 1 x 2-wire, 1 x 4-wire or 2 x 2-wire end
point per MD2 modem. Depending on the type of end point, a setting must be made on the
modem at the 5-pin DIL switch accessible from above.
RS-485 operation of the MD2
If several MD2s are connected in parallel over the RS-485 port, remember the following
when making the settings for the modem and setting the parameters for the TIM:
1. The MD2 modem must be set to the "interface with RS-485" mode using the 10-pin DIL
switch.
2. The RS-485 interface must also be activated at the 4-pin DIL switch accessible from
below.
3. The RS-485 interface of the TIM connected to the MD2 modem must also be activated at
the 8-pin DIL switch accessible from above (applies to all TIM 4 types).
4. When setting the parameters for the WAN access of the TIM connected to the MD2,
remember that a RTS-CTS delay ≥ 1 ms must be configured.
Figure 5-19
Note
If the MD2 is operated over its RS-485 port, no communication with the otherwise
incompatible MD100 modem is possible. These are only compatible when the RS-232
port of the MD2 is used.
174
Setting parameters for the WAN access in the "Dedicated Line" tab
SINAUT ST7 station control system
System Manual, 09/2016, C79000-G8976-C178-10
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