User manual
Manual Documentation Number: ESP901-902_4105m  Table of Contents  iii 
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 Pk – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445 – www.bb-europe.com 
CHAPTER 7: REMOVING VIRTUAL COM PORTS................................ 49 
REMOVING THE VIRTUAL COM PORT WITH ESP MANAGER .......................... 49 
REMOVING THE VIRTUAL COM PORT USING DEVICE MANAGER ................... 50 
CHAPTER 8: UPGRADING THE SERIAL SERVER FIRMWARE........ 53 
DOWNLOADING THE FIRMWARE ..................................................................... 53 
UPGRADING VIA ESP MANAGER .................................................................... 53 
Preparing the Software.............................................................................. 53 
Upgrading the Firmware ........................................................................... 54 
CHAPTER 9: USING CONSOLE MODE.................................................... 55 
CONSOLE MODE SETUP .................................................................................. 55 
Navigating the Configuration Menus......................................................... 56 
Using a Password ...................................................................................... 57 
CHAPTER 10: USING THE WEB SERVER ............................................... 59 
SETTING SERVER PROPERTIES ........................................................................ 59 
CHAPTER 11: USING TELNET................................................................... 63 
CONFIGURATION USING TELNET .................................................................... 63 
Navigating the Configuration Menu .......................................................... 64 
CHAPTER 12: ESP901 AND ESP902 TECHNICAL DATA ...................... 67 
APPENDIX A: RS-232 CONNECTIONS...................................................... 71 
SERIAL SERVER DB-9 PIN-OUTS IN RS-232 MODE ......................................... 71 
RS-232 Straight-through Cable Connections............................................. 72 
RS-232 Crossover (null modem) Cable Connections................................. 72 
RS-232 Straight-through DB-9 to DB-25 Conversion Connections........... 73 
RS-232 Crossover DB-9 to DB-25 Conversion Connections..................... 73 
RS-232 DTE Loopback Connections.......................................................... 74 
APPENDIX B: RS-422 CONNECTIONS...................................................... 75 
SERIAL SERVER DB-9 PIN-OUTS IN RS-422 MODE ......................................... 75 
APPENDIX C: RS-485 CONNECTIONS...................................................... 79 
SERIAL SERVER DB-9 PIN-OUT IN RS-485 MODE........................................... 79 
APPENDIX D: NETWORK CONNECTIONS............................................. 81 
STANDARD ETHERNET CABLE RJ-45 PIN-OUT................................................ 81 
CROSSOVER ETHERNET CABLE RJ-45 PIN-OUT .............................................. 82 
iv  Table of Contents  Manual Documentation Number: ESP901-902_4105m 
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 Pk – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445 – www.bb-europe.com 










