Digi One® SP

Compact Serial Server

  • Serial-to-Ethernet connectivity
  • TCP/UDP Socket Services for broad device connectivity
  • 1 switch selectable RS-232/422/485 serial port
  • Reverse Telnet for easy access to serial devices
How to Buy

The Digi One SP serial server provides reliable and cost-effective network connectivity for virtually any type of serial device. It features one of the smallest form factors available, industry leading low latency, baud rates up to 230 Kbps and full modem and hardware control. This compact and powerful serial-to-Ethernet solution is ideal for applications requiring simple and easy-to-use data communications.

This compact serial server supports a wide range of protocols using serial tunneling, TCP/UDP connections or Digi’s patented RealPort® COM port redirector for remote native COM port access. RealPort enables existing applications to communicate, without modification, with serial devices over the Ethernet as if they were communicating over a serial cable. Additionally, Digi One SP features modem emulation, allowing equipment designed for modem access to communicate transparently across the Ethernet.

Digi One SP is easy to install locally or remotely. The IP address can be configured using DHCP, ARP-Ping or Setup, an application included with the installation CD that automatically detects all Digi One devices on the network. Users can auto-connect a serial device to a networked server using raw, Telnet or rlogin. Advanced functions can be configured into an application using the web interface.


Specifications Digi One SP
Management HTTP configuration
Protocols TCP/UDP Socket Services, UDP Multicast, Telnet, Reverse Telnet, RFC2217, DHCP/RARP/ARP-Ping for IP address assignment
Software Patented RealPort COM port redirector for COM/TTY ports for Microsoft® Windows®, UNIX® and Linux®
Operating Systems for RealPort AIX, HP-UX, Solaris, Linux®, Windows® 2000, Windows® XP, Windows® 7, Windows® 8, Windows® 8.1, Windows® 10, Windows Server® 2003, Windows Server® 2008, Windows Server® 2012. Note: TCP/UDP socket services are operating system independent
Status LEDs Link, Power
(L x W x D)
3.70 in x 1.72 in x 0.93 in (9.40 cm x 4.30 cm x 2.30 cm)
Weight 2.29 oz (65.00 g)
Other Full modem and hardware flow control, Modem emulation, Wall mount kit (optional)
Serial Ports RS-232/422/485 (switch selectable)
Serial Connector DB-9M
Serial Throughput Up to 230 Kbps
Ethernet Physical Layer 10/100Base-T
Power Requirements
Power Input 9-30 VDC @ 0.5 Amps max
Power Supply Ships with a 120 VAC (North America) or a 120/240 VAC (International) power supply providing 12 VDC @ 0.5 Amps max power
Power Consumption Typical: 4 W; Max: 6 W
Product Surge Protection (ESD) 4 kV burst (EFT) per EN61000-4-4, 2 kV surge transient per EN61000-4-5
Operating Temperature 10º C to 45º C (50º F to 113º F)
Relative Humidity 5% to 90% (non-condensing)
Regulatory Approvals
Safety UL 60950, EN60950, CAN/CSA C22.2 No.60950
Emissions/Immunity FCC Part 15 Subpart B (Class A), EN55024, EN55022 (Class A), EN61000-3-2,3

Digi One SP - Front

Digi One SP - Back

Cable-to-Adapter Cross Reference

For ConnectPort TS and LTS, PortServes TS, Digi Neo and other Digi products with RJ-45 10 pin Connectors.

Note: Digi Passport, Digi CM and Etherlite use different pinouts, please refer to the appropriate product documentation

RJ-45 to Male or Female Straight or Crossover Application Cable or Adapter Pin-out Part Number Cable Identifier
DB-9 F Crossover Bay Accelar, Nortel and other DB-9 DTE devices Cable 76000645 (4’) How to buy 61090048
Adapter (4-Pack) 76000697 How to buy N/A
DB-9 M Crossover DTE devices with DB-9 female ports Cable 76000264 (4’) How to buy 61080048
Adapter None None N/A
DB-9 F Straight Modems and other DCE devices with DB-9 male ports Cable 76000200 (2’)
76000201 (4’)
How to buy
How to buy
Adapter None None N/A
DB-9 M Straight Modems and other DCE devices with DB-9 female ports Cable 76000239 (2’)
76000240 (4’)
How to buy
How to buy
Adapter (4-Pack) 76000701 How to buy N/A
DB-25 M Crossover Sun Sparc, Sun Ultra, terminals, printers and other DTE devices with DB-25 female ports Cable 76000238 (4’) How to buy 61040048
Adapter (4-Pack) 76000698 How to buy N/A
DB-25 F Crossover Cisco, IBM and other DTE devices with DB-25 male ports Cable 76000644 (4’) How to buy 61050048
Adapter (4-Pack) 76000699 How to buy N/A
DB-25 M Straight Modems and other DCE devices with DB-25 female ports Cable 76000129 (2’)
76000195 (4’)
How to buy
How to buy
Adapter (4-Pack) 76000700 How to buy N/A
DB-25 F Straight Modems and other DCE devices with DB-25 male ports Cable 76000198 (2’)
76000199 (4’)
How to buy
How to buy
Adapter None N/A
DB-25 M *Special* For use with printers. This cable utilizes the DTR signal (instead of RTS) for hardware flow control. Cable 76000643 (2’) How to buy 63000196-01
Adapter (4-Pack) 76000692 How to buy N/A
RJ-45 M *Special* For use with Cisco and Sun RJ-45 console ports. Cable 76000631 (6’)
76000632 (qty 8)
76000633 (qty 16)
How to buy
How to buy
How to buy
Adapter None None N/A
  • All RJ-45 to DBx cables are 10-pin. Only the RJ-45 to RJ-45 cable is an 8-pin cable.
  • All RJ-45 adapters are 8-pin. When using these adapters with modems or other applications that require DCD on pin 1, you must turn on altpin.
  • If altpin is turned off, the hardware signal on pin 1 becomes DSR instead of DCD. This alternative can be used if DCD is not required, and DSR is needed instead.





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