Toshiba AS311 - Manual (Page 38)

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ASCII Interface Module (AS311)
4. Register Configuration
4.2.4 Receiving 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
128 Channel 1
reading (receiving)
data area
448 words
576 Channel 1
writing (transmitting)
data area
448 words
1024 Channel 2
reading (receiving)
data area
448 words
1472 Channel 2
writing (transmitting)
data area
448 words
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.