
Multiplexer User's Guide
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mobile
3.2 Multiplexer control and signaling lines
The following chapter covers all information you need to develop and set up a virtual driver. Differences and restrictions in comparison to the unframed module are pointed out.
3.2.1 Flow control
Logical flow control
The internal logical flow control
RTS/CTS on the physical channels
Hardware flow control (AT\Q3) is recommended for use with multiplexer. For power saving it is indispensable. The setting AT\Q3 needs to be made before switching on the multiplexer.
The customer application decodes and encodes the data. To prevent loss of data, the application must be able process the information about internal flow control (MSC) regulated by the module. Flow control information is transmitted within the data flow and contains messages whether or not the channel is allowed to send. See chapter 4.3.9 for MSC.
As of Multiplexer Protocol version 2, the customer application must set RTS (in the direction to the module) on channel 1. RTS shall not be switched off to prevent loss of data (control data cannot be sent in this case). If flow control is needed, it is recommended to use logical flow control on every channel.
Mux_guide_v06 | Page 14 of 36 | 30.06.2004 |