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B&B Electronics ESP902E User Manual

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Making Hardware Connections 
Manual Documentation Number: ESP901-902-3704 
Chapter 2 
13 
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 
Default Mode 
When 
Default Mode
 is selected and the server properties are 
Updated
 
(
Saved
) all the configuration settings return to their default values. 
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Refer to Chapter 5 for details on Serial Server Configuration settings. 
See Chapter 12 for Serial Server default parameters. 
Console Mode 
In 
Console Mode
 the 
Configuration Menu
 can be accessed from a PC 
by connecting its RS-232 serial port to the ESP901 serial port or 
ESP902 Serial Port 1. Since the computer is a DTE device, and the 
serial ports are configured as DTEs (with DB-9M connectors), a null 
modem crossover cable must be used.  
In 
Console Mode
 the default serial port settings are: 
9600
 baud, 
8 data 
bits
, 
No parity
, and 
1 stop bit
. From Windows, HyperTerminal with 
VT100 terminal emulation can be used for 
Console Mode
 
configuration. 
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Refer to Chapter 9 for details on Console Mode 
Upgrade Mode 
In 
Upgrade Mode
 firmware can be uploaded from a PC via its serial 
port to the ESP901 serial port or ESP902 Serial Port 1. Upgrading also 
can be accomplished via the network connection, using the ESP 
Manager software and a virtual COM port. 
 
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Refer to Chapter 8 for details on Upgrade Mode 
RS-232 Mode 
In 
RS-232 Mode 
the currently selected serial port is configured as an 
RS-232 interface supporting eight RS-232 signal lines plus Signal 
Ground and is configured as a DTE, like a computer. Signals are single 
ended and referenced to Ground. To use handshaking, Flow Control 
must be set to RTS/CTS during Configuration.  
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Refer to Appendix A for RS-232 connection pin-outs. 
Making Hardware Connections 
14 
 Chapter 2 
Manual Documentation Number: ESP901-902-3704 
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 
RS-422 Mode 
In 
RS-422 Mode
 the currently selected serial port is configured as an 
RS-422 interface supporting four RS-422 signal channels with full 
duplex operation for 
Receive
, 
Transmit
, 
RTS 
(Request To Send) and 
CTS
 (Clear To Send). The data lines are differential pairs (A & B) in 
which the B line is positive relative to the A line in the idle (mark) 
state. Ground provides a common mode reference. To use handshaking, 
Flow Control must be set to RTS/CTS during configuration.  
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Refer to Appendix B RS-422 connection pin-outs. 
RS-485 Mode 
In 
RS-485 Mode
 the currently selected port is configured as an RS-485 
interface supporting transmit (TX) and receive (RX) signal channels 
using 2-wire, half-duplex operation. The data lines are differential with 
the Data B line positive relative to Data A in the idle (mark) state. 
Ground provides a common mode reference.  
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Refer to Appendix C for RS-485 connection pin-outs. 
RS-485 Receiver Biasing 
RS-485 Receiver Biasing
 can be implemented from the 
Serial Server
 
if the network does not supply it. Remove the two side-cover screws of 
the 
Serial Server
, slide the cover off and re-position the bias jumpers 
(shown open in the figure below) to enable biasing (shorting).  
 
Figure 10.  Internal Setting to Select RS-485 Bias 
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(For more information on RS-485 Receiver Biasing, see B&B 
Electronics RS-422/485 Application Note available at 
www.bb-
elec.com
)