94 PPC11A 6U VME Single Board Computer
Publication No. PPC11A-HRM/1
5.23
COM Port Mode Register (Offset 0x6BC)
Bits
Description
Default
7 & 6
Reserved (COM8 and 7 are not available)
00
b
5 to 0
COM6:1 mode:
1 = COM port transceiver in RS422 mode
0 = COM port transceiver in RS232 mode
0x00
5.24
COM Port RS485 Auto-Direction Control Enable Register (Offset 0x6BD)
The PPC11A does not support RS485 auto-direction control.
Bits
Description
Default
7 & 6
Reserved (COM8 and 7 are not available)
00
b
5 to 0
COM6:1 RS485 auto-direction control enable:
0 = Disabled
000000
b
5.25
COM Port Loopback Enable Register (Offset 0x6BE)
Test software can use loopback mode to test the basic functionality of the transceiver.
Bits
Description
Default
7
Reserved
0
6
COM6 loopback enable:
Transceiver loopback mode for
both
COM6 and COM5 is enabled by the COM5 control;
the COM6 control is ignored
0
5
COM5 (and COM6) loopback enable:
1 = COM port transceiver loopback mode enabled
0 = COM port transceiver loopback mode disabled (normal operation)
0
4 & 3
COM4:3 loopback enable:
1 = COM port transceiver loopback mode enabled
0 = COM port transceiver loopback mode disabled (normal operation)
00
b
2
COM2 loopback enable:
Transceiver loopback mode for
both
COM2 and COM1 is enabled by the COM1 control;
the COM2 control is ignored
0
1
COM1 (and COM2) loopback enable:
1 = COM port transceiver loopback mode enabled
0 = COM port transceiver loopback mode disabled (normal operation)
0
0
Reserved
0
Содержание PPC11A
Страница 1: ...Hardware Reference Manual PPC11A 6U VME Single Board Computer Edition 1 Publication No PPC11A HRM 1 ...
Страница 27: ...Publication No PPC11A HRM 1 Functional Description 27 Figure 4 2 Block Diagram T2081 ...
Страница 113: ...Publication No PPC11A HRM 1 Connectors 113 Figure 6 2 Rear Connector Position ...