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Application Examples
3.2 Binary-Signal Transmission Using the LOGEM928 and LGH28.8D Dedicated Line Modems
3.2
Binary-Signal Transmission Using the LOGEM928 and LGH28.8D
Dedicated Line Modems
The following describes the settings for binary-signal transmission via the dedicated line modems LOGEM928
and LGH28.8D (firmware 4.13) with 2-wire operation.
Settings of the DIP Switches on the Dedicated Line Modem
Before initializing the dedicated line modem, set the DIP switches on the modem as follows:
²
[scbstdipmodem, 1, --_--]
Figure 3-5
NOTE
i
i
The modem is switched off during the setting process. The changed settings are adopted only when the
dedicated line modem is switched on.
Initializing the Modem
Connect the PC to the modem using a modem cable.
²
Initialize the modem before commissioning. To do this, use a terminal program such as Hyperterminal.
²
Before initializing the modem, perform a reset. For this, press and hold the key when connecting the
²
auxiliary voltage until the LED A/O flashes.
Transmit the following AT commands via the Hyperterminal to the modem A and repeat the process for
²
modem B:
For 19 200 Bd:
Modem A: AT &F0 \N0 \Q0 &D0 F40 S51=11 %C0 S20=0 &L2 E0 Q1 &W↵
Modem B: AT &F0 \N0 \Q0 &D0 F40 S51=11 %C0 S20=0 &L3 E0 Q1 &W↵
→ Each modem responds with OK via the terminal.
Table 3-1
Command
&F0
\N0
\Q0
&D0
F40
S51=11
%C0
S20=0
&L2
&L3
E0
Q1
&W
26
DIP-Switch Setting
Explanation of the AT Commands:
Meaning
= Load factory settings
= Normal mode (no data compression, no error correction)
= No flow control
= Control line S1/108 is ignored
= Transmission scheme V.34
= Fixed baud rate to terminal device (RS232 interface)
= No data compression
= Ignore characters in command phase
= Calling modem
= Receiving modem
= No echo
= Deactivate result codes
= Write settings in EEPROM
Accessories, Binary signal transmitter 2-channel 7XV5653-0BA00, Manual
C53000-G9050-C607-2, Edition 03.2020
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