User manual
 Introduction 
Manual Documentation Number: ESP904-0504  Chapter 1  9 
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104 – www.bb-elec.com 
B&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445 – www.bb-europe.com
Network 
Communications 
LAN:   10/100 Mbps Auto-detecting 10 BaseT or 100 
BaseTX 
Protocols 
 TCP, IP, ARP, DHCP, Telnet, HTTP, UDP, ICMP 
Configuration 
Options 
Console Mode:  Using RS-232 with VT100 emulation 
Telnet Mode:  Using VT100 emulation 
  (software for Console Mode or Telnet not 
included, can use HyperTerminal in Windows) 
VLINX ESP Manager: 
Using Windows 98/ME/2000/XP and NT software 
includes: 
   - Search for VLINX ESP901 / ESP902 / 
ESP904 servers on network 
 - Configure Server Properties 
   - Add/Remove Virtual COM port in 
Windows 
   - Firmware download for future 
revisions 
Default Server 
Settings 
Server Name   ESP904 
Serial Number:    XXXXXXXXXX 
Password:   Blank 
DHCP:  Disable 
IP Address:  192.168.0.1 
Net Mask:  255.255.255.0 
Gateway: 192.168.0.254 
MAC Address:    Fixed – see bottom label 
Port 1  Console Mode 
Ports 2, 3, 4  RS-232 
Baud Rate:  9600 
Data/Parity/Stop:  8-N-1 
Flow Control: None 
TCP/UDP Ports:    TCP Port 1 – 4000 
 TCP Port 2 – 4001  
 TCP Port 3 – 4002 
 TCP Port 4 – 4003 
Connection Mode:  Server 
Remote IP Address: 255.255.255.255 
 Introduction 
10  Chapter 1  Manual Documentation Number: ESP904-0504 
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104 – www.bb-elec.com 
B&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445 – www.bb-europe.com
RJ-45
female
2.5 mm Tip (+)
Reset
1.1 mm
33.0 mm
43.0 mm
11.3 mm
33.0 mm
4.7 mm
113.7 mm
DB- 9M
male
DB- 9M
male
DB- 9M
male
DB- 9M
male
6.3 mm
6.9 mm
center
hole
10 mm
25.4 mm
3.7 mm hole3.7 mm hole
3 mm screw flathead
5.73 mm countersink
25.4 mm = 1 inch
12.7 mm
Ethernet
10/100M
Reset DC - In
Ready
Link
Power
ESP904 4-Port Serial Server
Software Selectab le RS-232/422/485
www.bb - elec. com
Port 4Port 3 Port 2Port 1
29.0 mm
185.0 mm
4-40 hex threads
161.5 mm
11 mm
8 mm
Figure 6. Dimensional Diagram of the ESP904










