Bay Technical Associates BayTech DS62 User Manual

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via binary, it is very likely that these values could be transmitted as data and the transmission 
would fail.  

 
2.  Hardware Handshaking: This style uses actual hardware lines. Like the TX and Rx lines, the 

RTS/CTS and DTR/DSR lines work together. When a receiver is ready for data, it will assert 
the RTS (Request to Send) line. This is then read by the sender at the CTS (Clear to Send) 
input, indicating it is clear to send the data. DTR (Data Terminal Ready) and DSR (Data Set 
Ready) allow the serial port and the modem to communicate their status. When the modem is 
ready for data to be sent, it will assert the DTR line indicating that a connection has been made 
across the phone line. This is read in through the DSR line and the modem can begin to send 
data. The general rule of thumb is that the DTR/DSR lines are used to indicate that the system 
is ready for communication where the RTS/CTS lines are used for individual packets of data.  

Select “Baud Rate” to change the rate the modem transfers Data bites per second, the DS displays the 
following: Default is 9600  

The word size is the measurement of the actual data bits in a transmission. Which setting you choose 
depends on what information you are transferring. For example, standard ASCII has values from 0 to 
127 (7 bits). Extended ASCII uses 0 to 255 (8 bits). If the data being transferred is simple text 
(standard ASCII), sending 7 bits of data per packet is sufficient for communication. A packet refers to 
a single byte transfer, including start/stop bits, data bits, and parity. 
 
Select “Word Size” and the DS displays the following: Default is 8