As311 Functions - Toshiba AS311 User Manual

1.2 AS311 functions

From the point of view of T3, the AS311 works as communications driver. The
followings are the simplified explanations for T3 and AS311 functions.
When a message (one set of transmission characters) is received by AS311, the flag
which indicates the receiving complete will come ON. T3 can check the flag status then
read the message from the AS311 by using the READ instruction.
In case of transmitting a message (one set of transmission characters) from T3 through
AS311, T3 writes the message into the AS311 by using the WRITE instruction, then
sets the flag which instruct the AS311 to start transmitting the message.
T3
Register
Here, a message (one set of transmission characters) means a string of ASCII
characters which is ended by specified trailing code. The default setting of the trailing
code is CR (carriage return code = H0D).
Applicable message format (default trailing code):
1
N: message length = 896 bytes max.
In other words, the AS311 cannot be used for the data communication in which the
transmission message is ended by two or more types of trailing code.
Buffer memory
READ Receiving
area
WRITE Transmitting
area
READ Receiving
area
WRITE Transmitting
area
2 3 4
1. AS311 Overview
AS311
Receiving
buffer
Transmitting
buffer
Receiving
buffer
Transmitting
buffer
N-1 N
CR
User's Manual
Channel 1
Channel 2
9