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1260-X121 User Manual
Module Operation 3-4
Racal Instruments
©
2005
address
So, for our example base A24 address computed earlier, the
following absolute addresses would apply for the operations
indicated:
205C01
Port A read or written at this location
205E01
ID register read at this location
Before explaining the particulars of reading and writing to port and
control registers, it is necessary to understand how the registers
interact with the 1260-X121 relays.
Table 3-2 through 3-5
provides a detailed explanation of each register and how it
interacts with the 1260-X121 module.
Table 3-1, Register Offset Addresses of the 1260-X121 Module
Register Offsets to Add to Base Module Address
Register
Name
Write Location (hexadecimal)
Read Location (hexadecimal)
0 0x01 0x01
1 0x03 0x03
2 0x05 0x05
3 0x07 0x07
ID
Read Only
0x201
EPROM Descriptor
Read Only
0x203
Table 3-2, ID Register Functionality of the 1260-X121 Module
Register Table
ID Register
Module Version
Bit
Functionality Description
0
1
2
3
4
5
6
All
7
Always Reads 0x00
(Read Only)