User manual
  Installing the VLINX ESP Software 
Manual Documentation Number: ESP904-0504  Chapter 2  11 
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
C
C
h
h
a
a
p
p
t
t
e
e
r
r
2
2
:
:
M
M
A
A
K
K
I
I
N
N
G
G
T
T
H
H
E
E
H
H
A
A
R
R
D
D
W
W
A
A
R
R
E
E
C
C
O
O
N
N
N
N
E
E
C
C
T
T
I
I
O
O
N
N
S
S
Package Checklist 
The ESP904 4-port serial server is shipped with the following items 
included: 
9  ESP904 Serial Server Module 
9  Power supply 
9  This manual 
9  CD-ROM disc with manual, VLINX ESP Manager and Virtual COM 
Driver software for Windows 98/ME/2000/XP/NT 4.0 
Figure 7. Side View of the ESP904 – when vertically mounted 
  Installing the VLINX ESP Software 
12   Chapter 2  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
ESP904 Connections, Indicators and Reset Switch 
The ESP904 has: 
•  Seven indicator LEDs 
•  One Ethernet connector  
•  A power connector 
•  A recessed reset switch 
•  Four serial port connectors 
Indicator Lights 
Light Indication 
Power 
Red - power is applied 
Link 
Yellow – 10BaseT Ethernet connection established 
Green – 100BaseTX Ethernet connection established 
Ready 
Flashing Green – system is ready 
Serial (4)  When set up as a TCP server: 
Steady Green - client has made a connection, 
communications starting 
Flashing Green – data present at serial port 
Light off – connection closed 
When setup in UDP mode: 
Steady Green (all ports) 
Flashing Green – data is being transmitted 
Ethernet Connector 
The ESP904 has a standard RJ-45 receptacle mounted in the top edge of the 
chassis. The ESP904 can be connected to an Ethernet hub, switch, or wall 
plate using a standard straight-through RJ-45 (male) Ethernet cable. To 
connect directly to an RJ45 Ethernet port on a PC or laptop a crossover 
Ethernet cable must be used.
N
N
o
o
t
t
e
e
:
:
Refer to Appendix D for details on Network Cables 










