Connector Assignments
4.5 COM1/2 Serial Interfaces
4.5.1 Basic Setting
The basic setting of the serial interfaces:
Bit rate:
9600 Baud
Data bits:
8
Parity:
no
Stop-bit:
1
Handshake: XON/XOFF
4.5.2 Configuration
The serial interfaces are controlled by the MPC5121. The bit rate of the interfaces can be set by
software. The serial controller and the RS-232 driver of the interface support bit rates up to 115.2
kbit/s.
4.5.3 Connection of the Serial Interface
The figures below explain the short terms of the signals used in the connector assignment. The
signal names are given exemplary for the connection of the CAN-CBX-CPU5201 as modem
(DCE).
4.5.3.1 2x RS-232 via COM1/2
Figure 13:
2x RS-232 via RJ12 socket
CAN-CBX-CPU5201
Hardware Manual • Doc. No.: C.3071.21 / Rev. 1.5
Page 31 of 53
TxD_S1
GND
RxD_S1
4
5
6
Pin number of
the 6-pin RJ12 socket
local
signal name
CAN-CBX-CPU5201
TxD_S0
RxD_S0
2
3
Adapter cable
RJ12<->
COM1
COM2
