4. Register Configuration
4.2.4Receiving and transmitting data area
The receiving and transmitting data area is provided to exchange the communication characters between T3 and AS311. The address ranges in the AS311 buffer memory are as follows.
Address | Word data |
128Channel 1
reading (receiving)
data area
576Channel 1
writing (transmitting)
data area
1024 | Channel 2 |
| reading (receiving) |
| data area |
1472 |
|
Channel 2 | |
| writing (transmitting) |
| data area |
448words
448words
448words
448words
When AS311 receives a message (one set of transmission characters), AS311 sets the characters into the receiving data area starting with the address 128 or 1024. Then T3 can read these characters from the receiving data area by using READ instruction.
When T3 attempts to send a message via AS311, T3 writes the characters into the transmitting data area starting with the address 576 or 1472 by using WRITE instruction, and instructs AS311 to start transmitting. AS311 recognizes from the character stored in the starting address (576 or 1472) to the trailing code character as the one set of transmitting message.
Refer to section 5 for message receiving/transmitting procedure.
36 ASCII Interface Module (AS311)
