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Compare Sena Terminal Servers

Sena supply terminal servers or serial device servers for all uses and all budgets, from the simple single-port terminal servers in the Lite series to 16 port advanced terminal servers. Different products have a range of features to suit your application, including various network interfaces and protocols, RS232, RS422 and RS485 support or 10 or 100Base-T.






Port 1 1 1/4/8 1 4/8/16
Serial Interface RS232 DB9 RS232/422/485 DB9 RS232/422/485 DB9 RS232 RJ45
Network Interface 10Base-T RJ45 10/100 Base-T RJ45 10/100Base-T RJ45 10/100Base-T RJ45
PC Card No No No Yes (1 PCMCIA slot)
Surge Protector No Yes Yes Yes Yes
RFC2217 No Yes Yes Yes Yes
Multiple host connection
No Yes
Max. 8
Max. 32
Max. 32
Port Buffering No Yes Yes Yes
Port Event Handling No Yes Yes Yes
Backup Host No Yes Yes Yes
System logging No Yes Yes Yes
Locating Server No Yes No No
Security ID/password ID/password, IP filtering ID/password, IP Filtering, SSH, SSL Data Encryption
Protocol ARP, IP/ICMP, TCP/IP, Telnet, DHCP client, PPPoE ARP, IP/ICMP, TCP/IP, Telnet, DHCP client, DNS ARP, IP/ICMP, TCP, UDP, Telnet/SSH, DNS, Dynamic DNS, HTTP, SMTP, DHCP, SNMP v1 & v2, SSL v3, RFC-2217 ARP, IP/ICMP, DNS, Dynamic DNS, SMTP with/without Authentication, pop-before SMTP, DHCP client, NTP, PPPoE, TCP, UDP, SSL v2 & v3, TLS v1, RFC-2217, SSH v1 & v2, Telnet, HTTP, HTTPS, SNMP v1 & v2
Serial Port Access protocol :
Serial Port Access Protocol :
Telnet, TCP, UDP, RFC-2217
Serial Port Access Protocol :
Telnet, TCP, UDP, SSL v3, RFC-2217
Serial Port Access Protocol :
Telnet, TCP, UDP, SSL v2 & v3, TLS v1, RFC-2217
Link LS100 LS110 PS110/410/810 SS100 STS400/800/1600

Sena Product Range

Sena supply all types of terminal server from a simple single-port serial device server to 16-port terminal servers for multiple serial port connections. They are used in all sorts of applications from connecting products with serial ports to a network, for example card readers, barcode scanners or instruments to complete systems with multiple units like tills being connected to a hub.

The STS series terminal servers are mostly used for larger systems, often developed from scratch, that enable many units to be connected to a network without each needing an expensive Ethernet adapter and a separate IP address. The STS series use one IP address, that can be static or use DCHP, and each serial unit is assigned its own port number. This allows data from each element to be easily separated in user software. .

Most customers just want to connect a single unit or just a few to an Ethernet network. Many products still use a serial port as it is much cheaper and simpler to implement or they may have legacy products with serial ports. Sena supply three ranges of serial device servers with 1, 2 or 4 ports for these applications and they are listed in the table above. .

To decide which type you need, study the table to see which features are necessary for your application. The Lite series LS100 and LS110 are the cheapest but your network must be configured to allow 10Base-T connections - some systems are configured for 100Base-T only. The Lite series don't have as many setup options and the configuration interface is not so intuitive as PS or SS series. .

The main reason to select PS series is that they come in multi-port options, support 10 or 100Base-T and have buffering, system logging and similar features. They can also be configured over the web and support more network protocols, such as HTTP and dynamic DNS. .

The Super Series, SS type, are used by people who require a high level of data security as they support Secure Socket Layer (SSL) data encryption and SSH security. They can also accept an external PCMCIA card for data storage. .

The choice comes down to selecting the unit that will carry out your job at the least cost. The LS100 is best for simple applications unless you must have some of the features of the more advanced models.