Installation and commissioning of the modems and routers
5.8 ISDN dial-up modem MD4
SINAUT ST7 station control system
218
System Manual, 09/2016, C79000-G8976-C178-10
5.8.1
Indicators and connectors accessible from the front
The following figure shows the front view of the MD4 modem with the front panels closed.
Figure 5-45 Front view of the MD4 modem with the front panels closed
LED displays of the MD4
The following table summarizes the meaning and activity of the six LEDs on the front of the
modem for dial-up operation.
Table 5- 42 Meaning of the LEDs on the front of the MD4 for dial-up operation
LED no. Labeling
Description
1
TXD
Transmit data
The LED flashes in rhythm with the data flow sent to the modem by the
end device (TIM) over the RS-232 or RS-485 interface.
2
RXD
Receive data
The LED flashes in rhythm with the data flow sent to the end device
(TIM) by the modem over the RS-232 or RS-485 interface. The data flow
is indicated both in the data and in the command phase.
Содержание SIMATIC NET TeleControl SINAUT ST7
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