Quatech Serial Device Server User Manual

information that a management network host can retrieve using the 

Get command. 

In addition to providing information upon request, the SDS supports 

a cold start Trap, which is a spontaneous message the SDS initiates 

whenever it boots up.  

Wi-Fi implementation  

Wi-Fi, short for wireless fidelity, allows Wi-Fi-enabled devices to 
connect to an Ethernet/Internet network without cables or wires. You 

can use a Wi-Fi network to connect these devices to each other, to the 

Internet, and to wired networks. Wi-Fi is a fast, powerful, reliable, 
and secure alternative to wired communication. 
Quatech’s Wi-Fi-enabled SDS devices provide serial-to-wireless 

network connectivity. They enable you to connect to and communicate 
with your serial devices over 802.11b wireless networks. These units 

all have a “W” incorporated in their names, such as SSEW-100 or 

DSEW-400. 
There are two access modes you can use with your Wi-Fi SDS, 

depending on whether or not an access point (AP) is involved.  

¾ 

Infrastructure uses an access point to link the SDS to other 

network devices.  

For example, an SDS connected to a POS device by a serial cable 
will send and receive POS data through an AP to a wireless 

network. Any PC connected to that network (either by a wired 

connection or via an AP) can communicate directly with the POS 
device. Optional WEP and WPA security protocols can encrypt 

data to protect it during transmission from the SDS to an AP. 

¾ 

Ad hoc directly links a SDS with another device without going 
through an access point. For example, if you connect a security 

camera’s serial port to an SDS, a wireless PC can connect directly 

to the security camera through the SDS without ever going 
through an AP. 

Before an SDS can communicate on an 802.11b wireless network, the 
WLAN settings must match those of the wireless network. By default, 

an SDS is set to Infrastructure network mode and its wireless 

Network Name (SSID) is blank, which will allow it to connect to any 
available wireless network.  

TCP socket services – IntelliSock™ 

The SDS implements Quatech’s IntelliSock™ TCP socket services.  
Quatech supplies device drivers for Windows 2000, NT4, XP, and 

Linux to make the SDS look like it is a built-in COM port.  
IntelliSock offers you the option of interfacing directly to the SDS 
through a TCP socket programming interface rather than using the 

virtual COM port device drivers.  IntelliSock can be used with any 
operating system that supports TCP/IP communication. 
Refer to the IntelliSock Software Developer’s Kit (SDK) folder on the 

installation CD-ROM for documentation and sample code.