Description of Units
CPCI-405
Hardware-Manual • Doc.-No.: I.2306.21 / Rev. 3.5
Page 21 of 57
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3.2.3 Connecting the RS-232-Interface SER 0
The diagram is used to explain the short terms for signals as used in the chapter (Connector
Assignments). The signal terms are exemplary for the connection of the CPCI-405 as a modem (DCE)
via the adapter cable RJ12-DSUB9.
Fig. 3.2.1: Connection diagram for RS-232 operation
3.2.4 Connecting the Serial Interface SER 1 with TTL-Level
If another serial interface is required, an adapter, for instance, which converts TTL-signals into RS-232-
signals can be connected to interface SER 1 via the 6-pin post connector X710 and flat ribbon cable.
Attention: The signals at the pins 3 and 6 will not only be used as TxD- and RxD-Signals. In the
boot sequence of the PowerPC 405 these signals are used to define the setting of the
operation mode (Strapping Pins). The level is defined by high-impedance local resistors
on the board.
Therefore the user has to ensure, that no pull-up or pull-down resistors with values
smaller than 10 kohm will be connected at the lines TxD-S1/STR17 or RxD-S1/STR18.
This could be happen with some modem types !