To create a virtual port pair, perform the following steps:
The feature to create pairs of virtual serial ports is available in both the Standard and the PRO editions of Virtual Serial Port Driver.
You can create a new port pair using one of the four methods you like the most.
Method 1. From the Main screen:
Click the “Pair” button:
Method 2. From the “New bundle” menu:
Click “New bundle” in the upper-left corner and pick the “Pair” option on the drop-down menu.
Method 3. Using the “Add a new pair” button:
Method 4. From the “Pair” tab:
Note: If a port name is already in use in some other bundle, it won’t be shown in the list.
You can create ports with custom names too (letters plus symbols – and _):
Enter the new bundle’s description for easier identification (optional). Also, you can tick the respective checkboxes if you need to enable strict baudrate emulation and/or want to create this bundle for your current session only. Choose the pinout preset for the new bundle or set a custom one:
Emulating physical line break
On the “All” tab, select a pair of ports you want to emulate a line break for, then click the “Break” button:
After that, all incoming signal lines (DCD, DSR, CTS, RI) will be dropped, and data from one port won’t be transferred to another one.
Restoring the connection
On the “All” tab, select the pair of ports you’ve emulated a line break for, and click the “Restore connection” button:
At the “Custom pinout” tab section, you can choose from signal lines pinout presets or create your own pinout preset just in a couple of clicks.
Pinout presets:
Standard: the default signal lines pinout RS232 null modem scheme with partial handshaking:
Loopback: the RS232 null-modem scheme with loopback handshaking:
Setting the custom pinout:
Note: Other null-modem schemes are available here.
Signal lines description:
RTS (Request to Send) – This signal is asserted (logic ‘0’, positive voltage) to prepare the DCE device for accepting transmitted data from the DTE device. Such preparation might include enabling the receive circuits9 or setting up the channel direction in half-duplex applications. When the DCE is ready, it acknowledges by asserting Clear to Send.
DTR (DTE Ready) – This signal is asserted (logic ‘0’, positive voltage) by the DTE device when it wishes to open a communications channel. If the DCE device is a modem, the assertion of DTE Ready prepares the modem to be connected to the telephone circuit, and, once connected, maintains the connection. When DTE Ready is de-asserted (logic ‘1’, negative voltage), the modem is switched to “on-hook” to terminate the connection.
CTS (Clear to Send) – This signal is asserted (logic ‘0’, positive voltage) by the DCE device to inform the DTE device that transmission may begin. RTS and CTS are commonly used as handshaking signals to moderate the flow of data into the DCE device.
DSR (DCE Ready) – When originating from a modem, this signal is asserted (logic ‘0’, positive voltage) when the following three conditions are all satisfied:
DCD (Carrier Detect) – This signal is relevant when the DCE device is a modem. It is asserted (logic ‘0’, positive voltage) by the modem when the telephone line is “off-hook”, a connection has been established, and an answer tone is being received from the remote modem. The signal is de-asserted when no answer tone is being received, or when the answer tone is of inadequate quality to meet the local modem’s requirements (perhaps due to a noisy channel).
RI (Ring Indicator) – This signal is relevant when the DCE device is a modem and is asserted (logic ‘0’, positive voltage) when a ringing signal is being received from the telephone line. The assertion time of this signal will approximately equal the duration of the ring signal, and it will be de-asserted between rings or when no ringing is present.
