Siemens Simatic S7-400 - Manual (Page 509)

Interface Submodules
13-13
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
Addressing in the M7-300/400-Reserved I/O Address Ares
Regardless of possible addresses in the AT-compatible I/O address area, the
IF 962-COM interface submodule can be addressed in this reserved address area.
The base address depends on the interface submodule slot in the expansion
module or the programmable module. See the descriptions “M7-300 Expansions”,
“M7-400 Expansions” or the description of the M7-400 programmable modules for
the slot-dependent base address of the interface submodule.
The I/O address is the sum of the base address and the offset address.
The registers and their meanings and the offset addresses are described below.
Table 13-10 Offset Address Assignments for the IF 962-COM Interface Submodule
Offset
Address
Function Remarks
00
H
Configuration register Read/write
08
H
- 0F
H
UART 16C552 parallel port Unused
10
H
- 17
H
COMa UART 16C552 Read/write
18
H
- 1F
H
COMb UART 16C552 Read/write
Configuration Register
The BIOS setup defines in which AT-compatible I/O address area the COM
interface is to be operated or whether it is only to be operated in the reserved I/O
address area and this information is stored in the configuration register.
Tables 13-11 to 13-13 give you an overview of the possible settings in the
configuration register.
Table 13-11 Offset Address for the Configuration Register (IF 962-COM)
Offset
Address
Function Remarks
00
H
Configuration register Read/write
Table 13-12 Meaning of the Data Bits in the Configuration Register (IF 962-COM)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 Addressing type COM b 0 Addressing type COM a