Toshiba PROSEC T1 User Manual page 263

CPU register « « « « T1S RS-485 port (T1S only)
<Receiving>
When the instruction input is ON, one set of message (from start character to the trailing code)
which is received by the RS-485 port is read from the receive buffer, and stored in the CPU
registers. The transfer size is fixed to 256 words. The execution status and the message length (in
bytes) are stored in the status flag.
The instruction input must be kept ON until the receiving operation is complete.
Example
Source designation
D0000
D0001
T1S RS-485 port
When R0000 is ON, one set of received message is read and stored in D0100 and after.
Execution status:H0000 ... Normal complete
Message length: 0 .............. No receive message
Note
· The XFER instruction is not executed as error in the following cases. In these cases, the instruction
error flag (ERF = S051) is set to ON. If the ERF is set to ON once, it remains ON until resetting to
OFF by user program.
(1) The leading address for the RS-485 port designation is other than 0.
(2) Transfer size is other than 256.
(3) Mode setting of the RS-485 port is not the free ASCII mode.
(4) This instruction is programmed in the sub-program #1.
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H0030 D0002
00000 D0003
D0004
H0001 ... Communication error (parity error, framing error)
H0002 ... Message length over (more than 512 bytes)
H0003 ... Receive buffer over flow
H0004 ... Receive time-out (from start character to the trailing code)
Baudrate
300, 600, 1200 bps
2400 bps
4800 bps
9600 bps
19200 bps
1 to 512 ... Message length in bytes
Transfer size
00256 (fixed)
Execution status
Message length
Time-out setting
30 seconds
15 seconds
7 seconds
3 seconds
1.5 seconds
Basic Hardware and Function
6F3B0250
7. Instructions
Destination designation
D0005 H0004
D0006 00100
D0100 (CPU register)
261