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10 Chapter 2 Documentation Number: ESP902-2303 Manual
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104
B&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445
Upgrade Mode
You can install newly revised firmware for the ESP902 using RS-232
connections from a PC, through the ESP Manager or through the Virtual COM
port. See Chapter 8 for details.
Console Mode
The Console mode provides access to the configuration menu using RS-232
connections. Connect a null modem crossover cable between the multi-
interface port and one of the computer’s RS-232 serial ports. The ESP902
Serial ports are wired as DTE like a computer using DB9M connectors, so a
crossover cable must be used to connect to another DTE port.
In Console mode the default serial port settings are: 9600 baud, 8 data bits,
No parity, and 1 stop bit. With Windows, you can use HyperTerminal with
VT100 terminal emulation for Console mode configuration. Use the default
settings only if they have not been changed. See Chapter 7 for details.
Bottom View
Serial Connections
RS-232
Signal Name
DTE
RS-232 DB9M
Pin
RS-422 RS-485
Carrier Detect In DCD 1 RXDA () --
Receive (Rx) Data In RXD 2 RXDB (+)
--
Transmit (Tx) Data Out TXD 3 TXDB (+) Data B (+)
DataTerminal
Ready
Out
DTR
4
TXDA ()
Data A ()
Signal Ground --- GND 5 GND GND
Data Set Ready In DSR 6 CTSA () --
Request To Send Out RTS 7 CTSB (+) --
Clear To Send In CTS 8 RTSB (+) --
Ring Indicator In RI 9 RTSA ()
Table 2.3 - Serial Connection Pin-outs for RS-232/RS-422/RS-485
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