Advantech BB-VESR921-MC

Ethernet Serial Server – VESR900 Fibre

  • Ethernet enable serial devices
  • Direct IP, virtual COM port, or paired mode
  • Ethernet pass-through port available
  • Ethernet Fibre – CAT 5 RJ45 and Multi-Mode ST Fibre
  • Serial RS-232/RS-422/485 ports, DB9 & TB
  • UL Class 1 Division 2


Take control of your serial devices with Vlinx™ VESR921-MC Industrial Ethernet Serial Servers. If it has a serial port, it can be monitored and controlled from anywhere on your Ethernet LAN or WAN. Keep it at maximum productivity without leaving your office. Even troubleshoot it from outside your LAN via the Internet. The easy to use Vlinx™ Manager software puts access to your whole shop on your desk. Configure devices, upgrade firmware and monitor activity. Configurafibtion changes can also be made using a web browser. VESR921-MC provides 1 Serial Port (DB9 & Terminal Blocks) and 1 CAT 5 RJ45, and 1 Multi-Mode ST Fibre connector.

Part Number Serial Ports Serial Connectors Ethernet Media Ethernet Connectors
BB-VESR921-MC 1 DB9 & TB CAT 5, Multi-mode Fibre One RJ45, One SC
Fibre Optic Technology
Type / Wavelength Multi-mode / 1310 nm
Output Power (-) 19 to (-) 14 dBm
Receive Sensitivity ~ (-) 32 dBm
Cable 62.5 / 125 µm
Connector SC or ST
Range 2 km (1.2 miles)
Serial Technology
RS-485 2-Wire Data A(-), Data B(+), GND
RS-422/485 4-Wire TDA(-), TDB(+), RDA(-), RDB(+), GND
Serial Connector DB9M or Removable Terminal Blocks
Data Rate Up to 230.4 Kbps
Source External
Input Voltage 10 to 48 VDC (58 VDC Maximum)
Connector Removable Terminal Block (12 – 28 AWG)
Power Consumption VESR92x: 6.0 Watts Max.
LED Indicators Serial Port, Ethernet Link, Ready
Switches Reset Button
Dimensions VESR92x: 14.86 x 10.11 x 2.96 cm (5.85 x 3.98 x 1.16 in)
Enclosure 35mm DIN mount, Plastic, IP 30
Weight VESR92x: 204.1 g (0.45 lbs)
Operating Temperature -40 to 80°C (-40 to 176°F)
Operating Humidity 10 to 95% Non-condensing
MTBF VESR92x: ~ 102593 hours
MTBF Calculation Method Parts Count Reliability Prediction
Serial Memory 8 KB per port
Network Memory 4KB
Network Communications
LAN 10/100 Mbps Auto-detecting , 10BaseT or 100BaseTX
Network Physical Layer Standards
Ethernet IEEE 802.3 auto detecting & auto MDI/MDX, 10BaseT and 100Base TX
IP Mode Static, DHCP
TCP/UDP User definable
Connection Mode Server, Client, VCOM, Paired
Client Connection At power up or upon data arrival
Search Serial direct COM and Ethernet Auto Search or specific IP
Diagnostics Display PC IP, ping, test VCOM, save test config (text readable)
Firmware Upgrade Vlinx Manager
Ethernet Pass-Through Port
Standards IEEE 802.3, 802.3u, 802.3x
Processing Type Store and Forward with 802.3x full duplex, non blocking flow control
Flow Control IEEE 802.3x flow control, back pressure flow control
MAC Address Table 2K
Configuration Software
Vlinx™ Manager Windows 2000, XP (32/64 bit), 2003 Server (32/64 bit), Vista (32/64 bit), 2008 Server (32/64 bit), Win 7 (32/64 bit)
Regulatory / Certifications / Safety
Compliance FCC, CE, NEMA TS2
UL Listed, File E222870 UL Class 1 Division 2 Groups A, B, C, D (HAZLOC) File E245458

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