Console mode, Upgrade mode, Rs-232 mode – B&B Electronics ESP904 - Manual User Manual
Page 20: Rs-422 mode
Making Hardware Connections
10
Chapter 2
Manual Documentation Number: ESP904-4513m
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
Console Mode
In
Console Mode
the ESP904
Configuration Menu
can be accessed from a
PC by connecting its RS-232 serial port to Port 1. Since the PC is a DTE
device, and the ESP904 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.
N
N
o
o
t
t
e
e
:
:
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 ESP904 Port 1, using RS-232. Upgrading also can be via the network
connection, using the ESP Manager software and a virtual COM port mapped
to the ESP904 Port 1.
N
N
o
o
t
t
e
e
:
:
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 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.
N
N
o
o
t
t
e
e
:
:
Refer to Appendix A for RS-232 connection pin-outs.
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 lines positive
relative to the A lines in the idle (mark) state. Ground provides a common
mode reference. To use handshaking Flow Control must be set to RTS/CTS
during configuration.