Function description
Operating Manual PIT m4SEU
1004648-EN-02
| 33
5.6.2.1
Transmitter-controlled communication mode
With transmitter-controlled communication mode, the PIT m4SEU (= transmitter) starts the
download of the Key ID number.
Features of this communication mode:
}
Download of Key ID number starts once the transponder key is inserted
}
Constant bit rate (100 ms)
}
Download on 2 data lines
}
Constant download time (typ. 1.8 s)
}
Monitored data download
}
Input/outputs required on the controller: 4 inputs and 2 outputs
}
Download is repeated by re-inserting the transponder key
No
special coding is required on the Key ID interface in order to download the Key ID num-
ber of a transponder key to the controller in transmitter-controlled communication mode.
The terminals (see also
) on the Key ID interface are used as
follows:
Key ID interface
Brief description of ap-
plication
Assignment control sys-
tem
Coding
IDo0
IDsync
Input
No coding required
IDo1
IDclock
Input
IDo2
IDout0
Input
IDo3
IDout1
Input
IDi0
IDin0
Output
IDi1
IDin1
Output
5.6.2.2
Handshake-controlled communication mode
With handshake-controlled communication mode, the download of the Key ID number is
started by the controller (Request).
Features of this communication mode:
}
Download starts via a request from the controller, once the transponder key is inserted
}
Download is repeated by a renewed request from the controller
}
Variable bit rate (min. 2 PLC cycles per bit)
}
Download on 1 data line
}
Min. download time: 28 Bit * (20 ms + 2 * PLC cycle)
}
Identifier for ID end for plausibility check
}
Input/outputs required on the controller: 3 inputs and 1 output
The Key ID interface must be coded with a jumper between IDo3 and IDi1 in order to down-
load the Key ID number of a transponder key to the controller in handshake-controlled com-
munication mode. The terminals (see also
) on the Key ID in-
terface are used as follows:
