Siemens Simatic M7-400 Reference Manual page 508

Interface Submodules
13.4.2 Addressing and Interrupts
Addressing
The IF 962-COM interface submodule can be addressed in the following two ways:
• In the AT-compatible I/O address area
• In the M7-300/400-reserved I/O address area (from C000
Addressing in the AT-Compatible I/O Address Area
The COM ports can be operated in the AT-compatible I/O address area. The
settings are made in the BIOS Setup. You can see the addresses that can be set in
the BIOS Setup from the following table.
Table 13-9
Name
*) *)
–
–
*) The BIOS searches the addresses in the order 03F8
assigns COM1, COM2, COM3 and COM4 in ascending order. There is no fixed
assignment of the I/O addresses to COMx. For example, if only one COM port is detected
at address 12E8
Example of Setting an AT-Compatible I/O Address
In the following example, the I/O addresses 03F8
(COM2) for COMb are to be set in the BIOS setup. Proceed as follows to do this:
1. Select the "IF Modules" page in the BIOS setup.
2. Enter the submodule receptacle number of the interface submodule in "Select
Module #".
3. Enter the offset address for the configuration register of the interface submodule
"00 " at "Config.Index"
H
4. Enter "36
(see also Table 13-13).
5. Press the OK button.
13-12
Addressing the COM Ports in the AT-Compatible Address Area
I/O Address
03F8 to 03FF
H H
02F8 to 02FF
H H
03E8 to 03EF
H H
02E8 to 02EF
H H
0380 to 0387
H H
0280 to 0287
H H
, this will be COM1.
H
.
" at "Value". This value is then written into the configuration register
H
S7-400, M7-400 Programmable Controllers Module Specifications
).
H
Remarks
Automatically configured by the BIOS and Automatically configured by the BIOS and
can be set in the BIOS setup.
, 02F8 , 03E8 and 02E8
H H H
(COM1) for COMa and 02F8
H
and
H
H
A5E00069467-07