General; Connections And Display Elements - Relay Mod002 Handbuch

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M-Bus – Modem Manual

1. General

The system for M-Bus data transmission through an analog telephone line comprises a
modem for the PC and a modem for the level converter from RS232C to M-Bus. It allows
remote transmission that complies with the data security level from EN1434–3 and the new
EN13757-2 in conformance with standards, especially the transmission of the even parity bit.
The modem may also be used in standard mode for standardized data transmissions (incl.
fax) with a data communications speed of up to 33600 baud.

2. Connections and Display Elements

The M-Bus modem contains two LEDs on the front to indicate the operating states. The
power LED indicates the ready state of the modem. The OH LED (OH = on hook) indicates
that a data communications connection has been established with a remote station modem.
M-Bus - MODEM 13.12.11, Version 3.0 Seite / Page 9