PCI Communication User Manual 28
4.3.3 Com Port Tab
Each COM tab represents a specific port you have selected for testing and configura-
tion. Each tab contains a Transfer Mode, Port Status, and Message Logo panel.
Transfer Modes
You can specify the transfer mode to be Normal, Loopback (Active), or Loopback
(Passive).
Normal: This setting enables simultaneous data transmission/reception. The data
signalling rate is helpful for identifying the performance of a communication card
installed on your system.
Loopback (Active)/Loopback (Passive): In loopback mode, a series of transmitted
data are expected to appear with the same structure on the receiving end. Using
loopback mode, you can check the integrity of the received data and determine
whether a transmission error has occurred. Active and passive loopback work in tan-
dem; under active loopback mode, a port will send data first and then receive data
later, whereas under passive mode, a port will take data received on the Rx line and
retransmit it via the Tx line. These two modes form a logical loop.
4.3.4 Port Status
The port status labels are defined as follows:
DTR: Data terminal ready
DSR: Data set ready
RTS: Request to send
CTS: Clear to send
CD: Carrier detect
For RS-232 specifications, DTR and RTS are for output signals and can be toggled
on/off by double-clicking the corresponding labels. However, if you are using RTS/
CTS for flow control to run the test, you will notice that RTS appears in black. This
indicates that the RTS can no longer be toggled on/off since it is controlled by the
driver.
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