Technical data

Making the Hardware Connections
Serial Port(s)
• ESR901: One serial port with two connector options: one (DB-9M) or
one five-terminal removable terminal block (DIP switch selectable)
• ESR902: Two serial port connectors (DB-9M)
• ESR904: Four serial port connectors (DB-9M)
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Refer to Appendices A, B and C for connection pin-outs.
Power Connector
The power connector is a removable terminal block with four terminals.
From top to bottom the terminals are:
Terminal Connect to Description
GND
Negative side of DC
power supply (if DC
power used)
Also connect negative
side of Backup DC
power supply (if used)
Internally, the chassis ground of the Serial
Server is connected to this terminal.
AC In
One side of AC power
supply (if AC power
used)
AC/DC +
In
The other side of AC
power supply (if AC
power used)
OR
Positive side of DC
power supply (if DC
power used)
Either AC or DC power can be used to
power ESR Serial Servers. Power supply can
voltages range from 9 V to 48 VDC or 8 V
to 24 VAC.
Backup
DC+ In
Positive side of
Backup DC power
supply
Backup power must be DC voltage and can
be any voltage between 9 VDC and 48 VDC.
Serial Server/Port Operational Modes
Using the ESP Manager, Web Server or Telnet the Serial Server can be put
into Console Mode, Default Mode or Upgrade Mode. The serial ports can be
configured for RS-232, RS-422, RS-485H (half duplex) or RS-485F (full
duplex) operation. The server also can be put into
Console Mode by placing
the
Run/Console switch in the Console position.
Manual Documentation Number: ESR90x-1705m Chapter 2 11
B&B Electronics Mfg Co Inc – 707 Dayton Rd - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone] – www.bb-elec.com
B&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph [phone] – Fax [phone] – www.bb-europe.com
Making the Hardware Connections
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 ESR901 serial port or ESR902/904
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 ESR901 serial port or ESR902/904 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.
12 Chapter 2 Manual Documentation Number: ESR90x-1705m
B&B Electronics Mfg Co Inc – 707 Dayton Rd - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone] – www.bb-elec.com
B&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph [phone] – Fax [phone] – www.bb-europe.com