
MODBUS RTU
COMMUNICATIONS GUIDE
26
PC Personal Computer
Receive Incoming communication signal. (Rx)
RTS RequestToSend hardware handshaking signal. Used with ClearToSend.
Rx See Receive
RxA Usually the negative Receive line. May vary with manufacturer. Also see
Receive
RxB Usually the positive Receive line. May vary with manufacturer. Also see
Receive
Signed Integer Whole number value represented by 16 bits (-32768 to 32767)
Transmit Outgoing communication signal. (Tx)
Tri-State The ability of a communications transmitter to turn its circuitry off, reducing
the load on the network
Tx see Transmit
TxA Usually the negative Transmit line. May vary with manufacturer. Also see
Transmit
TxB Usually the positive Transmit line. May vary with manufacturer. Also see
Transmit
Unsigned Integer Positive whole number value represented by 16 bits (0 to 65535)
Word A group of 16 bits
Xon/Xoff Software implementation of data flow control
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