Rts toggle options, Button – Comtrol DeviceMaster NS-Link User Manual
Page 44
44 - Configuring COM Port Properties
DeviceMaster Driver User Guide: 2000595 Rev. A
NS-Link Device Driver Configuration
The following table provides information about the options on the port General tab.
Port Settings
General Tab
Description
RS Mode
Default = RS-232
Use this drop-down list to select the communications mode for the serial
device that you will be connecting to this port.
•
RS-232
•
RS-422
•
RS-485 Mode provides these choices, depending on the model.
Note: The DeviceMaster LT and DeviceMaster RTS 2-port models
support RS-485 4-wire, Slave or Master. The DeviceMaster PRO
and other DeviceMaster RTS models only support RS-485 2-wire.
-
RS-485 2-wire (half-duplex) supports transmit and receive data. When
data is transmitted, the Transmit Enable signal is activated, and the
transmit receive device switches from receive to transmit
automatically.
-
RS-485 4-wire Master (full-duplex master) supports transmit and
receive data, which means both signals are always active. The
DeviceMaster is enabled by the Transmit Enable signal. This mode is
the same as RS-422.
-
RS-485 4-wire Slave (full-duplex slave) supports transmit and receive
data. When data is transmitted, the Transmit Enable signal is
activated, the transmit device goes active and starts sending data.
When the data is not being sent, the transmit device is inactive. The
receive device is always active. If you click RS-485, you may need to
change settings in the
screen.
Note: The DeviceMaster Serial Hub default value is RS-422, the default
value is RS-232 for other DeviceMasters.
Override and Lock
Baud Rate to
Default = None
This option allows you to lock selected ports.
You can select a value from the drop-down list or enter an appropriate value
from the following standard baud rates: 300, 600, 1200, 1800, 2400, 3600,
4800, 7200, 9600, 14400, 19200, 38400, 57600, 115200, 230400, 460800, or
921600.
After locking a baud rate, no matter what baud rate is selected in a host
application, the actual rate used is the rate specified here.
RTS Toggle Options
This button opens the RTS Toggle Options popup, which provides the
following features:
•
Override and Lock to RS-485 Toggle Mode
Use the Override and Lock to RTS Toggle Mode option to lock the port in
RTS (Request to Send) toggle mode, then set the mode (low or high) as
desired for RS-485 mode.
•
RS-485 Toggle RTS Low
Use the RTS Toggle RTS Low option to toggle the RTS output signal low
during data transmission, which may be needed for relay devices for RS-
485.
If the option box is not checked, RTS is toggled high (asserted) during
data transmission for RS-485 mode.
•
Defaults
Clicking the Defaults button returns all the values in the RTS Toggle
Options popup to their default state:
-
Override and Lock to RTS Toggle Mode = Disabled
-
RTS Toggle RTS Low = Disabled