B&B Electronics Server RS-232 用户手册
Making Hardware Connections
Manual Documentation Number: ESP901-902_4105m
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.
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.
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.
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.
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_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
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
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.
state. Ground provides a common mode reference. To use handshaking,
Flow Control must be set to RTS/CTS during configuration.
N
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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.
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
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
)