Bernecker + Rainer 5PC820.SX01-00, User Manual, Page: 53 / 318

Technical data • Entire device
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53 Automation PC 820 User's Manual V 1.20
2.6.6 Serial interface COM2
I/O address and IRQ
The setting for the I/O address and the IRQ can be changed in the BIOS setup (under
"Advanced" - submenu "Baseboard/Panel Features" - submenu "Legacy Devices", setting "COM
B"). Please note any potential conflicts with other resources when changing this setting.
Bus length and cable type RS232
The maximum transfer rate of 115 kBit/s depends on the cable type being used.
Serial interface COM2
RS232 RS422/485
9-pin DSUB connector
Type RS232 not modem compatible;
Electrically isolated
UART 16550 compatible, 16 byte FIFO
Transfer rate Max. 115 kBit/s
Bus length Max. 15 m Max. 1200 m
Pin Assignments
(RS232)
Assignments
(RS422)
1 n.c. TXD\
2 RXD n.c.
3 TXD n.c.
4 n.c. TXD
5 GND GND
6 n.c. RXD\
7 RTS n.c.
8 CTS n.c.
9 n.c. RXD
Table 22: Pin assignments - COM2
Resource Default setting Additional setting options
I/O address 2E8h 238, 2F8, 338, 3E8, 3F8
IRQ IRQ10 IRQ 3, 4, 5, 7, 11, 12
Table 23: RS232/422/485 - I/O address and IRQ
Extension Transfer rate
≤
15 m typ. 64 kBit/s
≤
10 m typ. 115 kBit/s
≤
5 m typ. 115 kBit/s
Table 24: RS232 - Bus length and transfer rate
COM1
COM2
1
5
6 9