Toshiba SX 2000 - Manual (Page 44)

1.4 Free ASCII mode
1.4.1 Free ASCII communication function
The free ASCII mode is used to connect between the S2T and various serial ASCII
devices, such as a micro computer, bar code reader, printer, display, etc.
By using this mode, the S2T can work as a communication master. Therefore, the
S2T can communicate with other PLCs using the computer link protocol, and can
control variable speed drives (such as Toshiba’s VF-S7) using its communication
protocol.
In this mode, user defined ASCII messages can be transmitted and/or received
through the serial port of the S2T, link port (RS-485).
The ASCII 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 = HOD).
1.4 Free ASCII mode
Applicable message format (default trailing code):
1 2 3 4 N-1 N
CR
N: message length = 512 bytes max.
In other words, the S2T cannot be used for the data communication in which the
transmission message is ended by two or more types of trailing code.
NOTE
The Free ASCII mode works as half-duplex communication system.
Therefore, simultaneous operation of transmitting and receiving is not possible.
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