Janz Tec emPC-A500, User Manual, Page: 11 / 17

em
PC
- A500 ( Hardware Manual )
•
Installation 2 - 11
Rev. 1.0
© Janz Tec AG
2.2 Interfaces
The pin out for the D-SUB connectors is described in Table 2.
Pin RS232 RS232
(console)
CAN RS485
1 DCD n.c. n.c. n.c.
2
RxD RxD CANL B / D+
3 TxD TxD GND GND
4 DTR n.c. n.c. n.c.
5 GND n.c.
n.c. n.c.
6 DSR n.c. GND GND
7
RTS RTS CANH A / D-
8 CTS CTS n.c. n.c.
9 RI n.c. VEXT
1
n.c.
Table 2: D-SUB pin out
The pin assignment is shown in Table 2, the following table shows which systems has what interface
connected to the D-SUB connectors. The MOD_BASE address is generated by the configuration
process for the power supply board which is described in the System Reference Manual for A500-
Platforms.
Product Interface Windows Linux Phys-Address
Serial-0 (Console) COM2 ttyS1 0x73FBC000 em
PC-A500/0
Serial-1 (Console) COM1 ttyS0 0x7000C000
Serial (Console) COM1 ttyS0 0x7000C000 em
PC-A500/1
CAN CAN0/mpcan_00 /dev/pcan_0 MOD_BASE
CAN0 CAN0/mpcan_00 /dev/pcan_0 MOD_BASE em
PC-A500/2
CAN1 CAN1/mpcan_01 /dev/pcan_1 MOD_BASE + 0x200
Serial-0 (Console) COM1 ttyS0 0x7000C000
Serial-1 xx ttyS2 MOD_BASE + 0x400
Serial-2 xx ttyS3 MOD_BASE + 0x500
em
PC-A500/R3
CAN CAN0/mpcan_00 /dev/pcan_0 MOD_BASE
Table 3: Interfaces connected to D-SUB
2.2.1 RS232
The serial interface is implemented by a XR16V2750 dual UART chip. For a description of UART
registers refer to the chip manual. The UART clock input is 14,7456MHz to allow error free generation
of standard baud rates. It is also possible to switch over to a 16MHz clock frequency to be able to
provide non-standard bitrates (e.g. 250Kbit). This RS232 variant provides all 8 interface signals as
shown in Table 2 column 1.
2.2.2 RS232 (Console)
This serial interface is implemented by the i.MX515. It provides the signals RxD, TxD, RTS and CTS
only (see Table 2 column 2).
1
This signal is optionally available to provide power to supply an external transceiver module