Serial port configurations
COM1 and COM2 are enabled and configured in BIOS Setup. COM1 has a fixed
address of 3F8h, and uses IRQ 4. It can be enabled or disabled in Setup. The
default is enabled.
COM2 has a fixed address of 2F8h and IRQ 3. It can be configured in Setup for RS–
232, RS–422/485, or disabled. The default is RS–232.
The COM port interrupts can be routed so that different interrupts are used. See
page 93.
If COM2 is used for RS–422 or RS–485, and the 5266 is at the end of the network,
the ports will have to be terminated. Switch 2, positions 3 and 4, terminate the
network. The default setting is
un
terminated. If the 5266 is at the end of the
network the switch must be set to terminated.
Table 4–2 shows the COM pin-outs for the COM ports, and table 4–3 shows the
switch settings.
Figure 4–1
COM ports
Serial Device
on COM2
Serial Device
on COM1
VTC-20F cable
5266 CPU Card
46
Содержание 5266
Страница 18: ...Figure 2 1 5266 component diagram top 18 ...
Страница 19: ...Figure 2 2 5266 component diagram bottom 19 ...
Страница 20: ...Figure 2 3 5266 dimensions inches 20 ...
Страница 21: ...Figure 2 4 5266 dimensions mm 21 ...