911 Carrera 4 Cabriolet (996) F6-3.4L (1999)
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MOST - Optical/Electrical
MOST signals are transferred electrically within the PCM2 and optically outside of the PCM2. Internally, the PCM2 consists of at least 2 nodes (GW
and MMI), which are installed in the device and can also be expanded to four nodes by adding the navigation and VOCS nodes (optional).
The data is transferred outside of the PCM2 via the optical waveguide, which creates a connection to the nodes in the external MOST control modules
such as external amplifiers, CD changers, and/or telephone/telematics (optional, depending on the equipment). The gateway node represents the
connection to CAN comfort.
MOST Actual and Required Installed Components Lists
MOST Actual And Required Installed Components Lists
All MOST control modules that are connected to the PCM2 are entered in the 'required installed components list'. The 'actual installed components list' is
compared with the 'required installed components list' each time the PCM2 is started. If an 'installed MOST control module' is not reported, the MOST is
switched off optically and a fault is recorded in the gateway.
MOST Lock/Most Unlock
MOST Lock/MOST Unlock
A lock occurs when the signal sent from the MMI via the wake-up/ ring break diagnosis line is understood and answered by the connected MOST control
modules; this results in a 'lock (connection)'. The lock is maintained until the signal disappears, i.e. an 'unlock' occurs.
MOST Switch
MOST Switch
The MOST switch is part of the PCM2. It keeps the electrical MOST closed if no other MOST control module is optically connected to the MOST. The
MOST switch is opened when a light signal is received from the connected MOST control modules.
The following settings can be coded:
-
MOST switch open.
-
MOST switch closed.
NOTE:
-
When the PCM2 is replaced, the coding must be performed in accordance with the connected MOST control modules.
-
When the 'Switch closed' parameter is set, the switch remains closed even in existing MOST control modules. Communication is then not possible.
MOST Unlock Counter
MOST Unlock Counter
Interruptions occur in the system if perfect communication is no longer possible. If the relevant threshold values are exceeded, an entry is recorded in the
appropriate control module and the 'unlock counter' is incremented.
Navigation
Navigation
The navigation module is designed as a module box, which can be inserted in the PCM2 as an option. After the insertion, an electronic switch is opened
automatically and the module is integrated into the MOST ring.
PCM2 Control Module (Head Unit)
PCM2 Control Module (Head Unit)
The PCM2 control module (head unit) includes the following components:
Internal:
PCM2 gateway.
PCM2 Man Machine Interface (MMI).
Internal amplifier (optional, depending on the equipment).
Tuner.
Single CD.
Navigation (optional/insertion).
VOCS (voice control system) (optional/insertion).
