45
)
Figure 4-18. Set up the data bits, stop bits, parity
4.2.4 Flow control
The factory default setting of the flow control is
None
. Only hardware flow control using RTS/CTS is
supported by the HelloDevice Pro Series. Hardware flow control method controls data communication
flow by sending signals back and forth between two connected devices.
Note:
Flow control is supported only in RS232 mode. RS422 and RS485 mode do not support any kind of
flow control method in hardware or software.
It can be configured using the menu
6.Flow control
.
---------------------------------------------------------------------------
Serial configuration --> port#1 ---> UART
---------------------------------------------------------------------------
Select menu
1. Type : RS232
2. Baud rate : 9600
3. Data bits : 8
4. parity : None
5. Stop Bits : 1
6. Flow control : Hardware
7. DTR behavior : Always High
8. DSR behavior : None
<ESC> Back, <ENTER> Refresh
-----> 6
Select flow control (1 = None, 2 = Hardware) :
Figure 4-19. Set up the flow control
4.2.5 DTR/DSR behavior
The purpose of the DTR/DSR pin is to emulate modem signal control or to control TCP connection
state by using serial port signal. The DTR is a write-only output signal, whereas the DSR is a read-only
input signal in the HelloDevice Pro Series side.
The DTR output behavior can be set to one of three types:
always high, always low or show TCP
connection
. If the DTR behavior is set to
show TCP connection
, the state of the DTR pin will be
maintained high if the TCP connection is established.
The DSR input behavior can be set to one of three types:
none, open/close TCP connection or allow
TCP connection only by high
.
Open/close TCP connection
is valid only if the host mode is a TCP client
or equivalent. If the DSR behavior is set to
open/close TCP connection
, the high state of the DSR pin
will make the HelloDevice Pro Series send a connection request to the specified destination host,