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iPac HCS12 Manual.doc
- 8 -
Rev 1.2 - 11/11/03
2.7 RS232 SERIAL 0 UART
The iPac HCS12 provides one dedicated RS232 UART Serial 0 which has software configurable baud rates. Both
transmission and asynchronous data reception are possible. Handshake Lines are implemented by the use of port lines PH0
and PK0.
Table 7: RS232 (HDR8)
Pin
Signal
DB9 Description
1
NC
-
2
NC
TxD
3
TxD
RxD
4
CTS (PH0)
-
5
RxD
GND
6
RTS (PK0)
-
7
NC
CTS (PH0)
8
NC
RTS (PK0)
9
GND
-
10
NC
2.8 RS 232/422/485 SERIAL 1 UART
The iPac HCS12 provides one jumper (JP 3) selectable RS 232/422/485 UART which has software configurable baud rates.
Both transmission and asynchronous data reception are possible. RS232 Handshake Lines are implemented by the use of PH1
and PK1. When using this serial port in the RS422/485 mode, Handshake Line PK1 controls the transmitter enable line of the
RS422/485 driver.
Table 8: RS485 (HDR9)
Pin
Signal
DB9 Description
1
RS422/485 TX-
RS422/485 TX-
2
NC RS232 TXD or 422/485 TX+
3 RS232 TXD or 422/485 TX+ RS232 RXD or 422/485 RX+
4
CTS (PH1)
RS422/485 RX-
5 RS232 RXD or 422/485 RX+
GND
6
RTS (PK1)
-
7
RS422/485 RX-
CTS (PH1)
8
NC
RTS (PK1)
9
GND
-
10
NC
