Toshiba AS311 Manual De Usuario

ASCII Interface Module (AS311) 

 
 

 
 

 

The AS311 has the I/O type ‘i X+Y 4W’ for I/O allocation. When the automatic I/O 

 

 

allocation is performed with mounting the AS311, the following I/O allocation table will 

 

 

be created in the T3. 

 
 

 

(T-PDS screen example - in the case that AS311 is mounted on Slot 0 of Unit 0) 

 

 

 

 

 
 
 

 

Then, 4 I/O registers, XW(n), XW(n+1), YW(n+2) and YW(n+3), are assigned to the 

  

AS311. 

 

 

In the above example, XW000, XW001, YW002 and YW003 are assigned. 

 
 

 

Note that the I/O type has ‘i’ designation. It means that the T3 will not update the   

 

 

assigned I/O registers in the batch I/O processing. To read or write data through 

 

 

the I/O registers, the Direct I/O instruction (FUN235) or the direct I/O designation 

 

 

(I/IW and O/OW instead of X/XW and Y/YW) is necessary. 

 

 

The reason of that is because the reading and writing timings are important for  

 

 

handshaking between T3 and AS311. Refer to section 5.