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MODEM COMMUNICATION TO ABB RELAYS
Position 4 UP-Echo Offline Commands
Position 5 UP – Auto Answer on the first ring, or higher if specified in NVRAM
Position 6 DOWN – Carrier Detect Override
Position 7 UP – Load NVRAM defaults
Position 8 DOWN – Smart Mode
In setting the modems via the AT command set, it was determined that the modem closest to the
computer executing the RCP program shall use the factory defaults of the modem right out of the box. If
one was to view the USROBOTICS troubleshooting guide (available on the
www.3com.com
website) the
factory defaults are listed in the downloadable files.
For the modem attached to the RCP program, one must change a few parameters within the modem to
ensure connectivity. Starting with the factory default settings with the modem right out of the box, one
should issue the AT commands:
AT&H0&D0&K0&R1&S0
Which corresponds to the following definitions as designated in the USROBOTICS literature:
&H0 = Flow Control Disabled
&D0 = DTR Override (Default)
&K0 = DATA COMPRESSION DISABLED
&R1 = MODEM IGNORES RTS
&S0 = DSR OVERRIDE ALWAYS ON
As stated previously, other commands could be issued to the modem to allow it to peacefully co-exist and
operate with the PONI R card. It is highly recommended to write the settings to the EEPROM in the
modem by issuing the AT&W 1 or AT&W2 command.
STEP 4
The RCP program must now be configured to operate with the modem and issue the commands. The
steps to use this are as follows:
One must start RCP and enter the standard start screen as illustrated in Figure 22.
Figure 22. RCP Standard Setup Screen
Page 17 of 47
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