Toshiba TLP411E, Technical Training Manual

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5-13
15. RS-232C CONTROL METHOD
Signals are connected to the RS-232C connector in a straight
format as shown in Table 5-9 RS-232C connection signals.
This is because a crossing connection is provided inside
the unit. Communication conditions are set to meet the con-
ditions given in Table 5-10.
Table 5-9 RS-232C connection signals
Table 5-10 RS-232C communication conditions
16. RS-232C COMMAND LIST
Table 5-11 shows the RS-232C command list.
As a return value for a specified command received, an
acknowledgment signal (ACK = 06h) is output when the
command is correctly received within the operating condi-
tions, or a non-acknowledgment signal (NAK = 16h) is out-
put without the operating condition. Nothing is output if
reception terminates abnormally.
When sending a command, leave the interval for at least
100 ms. Moreover, a longer process time is necessary at
the power on or off, and input switching, so take care to
leave a sufficient interval.
Pin No. Signal name Signal content I/O
2 RXD Receive data I
3 TXD Transmit data O
4 DTR Data terminal ready O
5 S. G Signal ground I
6 DSR Data set ready I
7 RTS Transmission request O
8 CTS Transmission enable I
Item Conditions
Communication system Transmission speed 9600 baud, No parity, data length 8 bit, Stop bit: 1 bit
Communication type
STX (1 byte) + CMD (3 byte) + ETX (1 byte) = 1 block
STX is 02h, ETX is 03h, CMD is command string (Uppercase character)