EKI-1351/EKI-1352/EKI-1521/1522/1524 User Manual 10
2.1.2.1 Normal Mode
The Advantech redirector connects the Advantech serial device server while an
application open the COM port and disconnects from the Advantech serial device
server when the application closes the COM port. The redirector uses TCP network
connections to the Advantech serial device server to gain the access to the
connected serial devices.
2.1.2.2 Mutli-Access Mode (Shared COM port mode)
Most of serial devices are connected directly and physically to the PC serial ports via
a cable. The operation system, ex. Windows XP, provides the COM ports that user’s
application can access, and control the serial device through the serial cable. This
means that the serial device can be connected to one host and only one application
on this host can handle input, output and control operation on this device.
If you want to run more than one applications to use a serial device, you can employ
EKI serial device servers that provide a virtual COM pool for a host or multi-hosts on
an Ethernet network. EKI serial device server is located between hosts and serial
devices. Each serial port on the EKI serial device server can allow max. of 5 host
connections through one Ethernet port and two Ethernet ports. There are two major
operation modes for Multi-Access Mode. First one is broadcast mode, EKI serial
device server handles a command from one application and replies the data from the
serial port to all applications that are connecting this serial port. Another one is polling
mode. EKI serial device server handles the command from one application and reply
to this application only. Query from other applications must be queued and wait for
current process completing.
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