Formosa Industrial Computing MBM-530NS, Руководство пользователя

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-100- MBM-530NS User’s Manual
(2) Send out one character (Transmit)
Step 1:
Enable the TXC signal, and the bit 0 of the address of 4
just sets at “1”.
Step 2:
Send out the data. (Write this character to the 0 of the
current COM port address)
Step 3:
Wait for the buffer’s data to empty. Check the transmitter
holding register (THRE, bit 5 of the address of 5), and
transmitter shift register (TSRE, bit 6 of the address of 5)
is all sets that must be at “0”.
Step 4:
Disabled the TXC signal, and the bit 0 of the address of
4 sets at “0”
(3) Send out one block data (Transmit – the data more than two characters)
Step 1:
Enable the TXC signal, and the bit 0 of the address of 4
just sets at “1”.
Step 2:
Send out the data. (Write all data to the 0 of the current
COM port address)
Step 3:
Wait for the buffer’s data to empty. Check the transmitter
holding register (THRE, bit 5 of the address of 5), and
transmitter shift register (TSRE, bit 6 of the address of 5)
is all sets that must be at “0”.
Step 4:
Disabled the TXC signal, and the bit 0 of the address of
4 sets at “0”.
(4) Receive data
The RS-485’s operation of receiving data is the same as the RS-232’s.