Remote Communications; Modem Requirements; No Set-Up For Standard Modem Behavior; Automatic Baudrate Synchronization - Honeywell Excel 50 Installation Instructions Manual

speed automatically according to the preset values. This
automatic detection can take up to 5 seconds.

REMOTE COMMUNICATIONS

Firmware version number 2.01.00 or later supports the direct
connection of modems or ISDN terminal adapters for
communications to up to three remote XBS building super-
visors.
NOTE: XBSi building supervisors are not supported for
remote communication.
NOTE: Communication via ISDN is applicable only for
Europe.

Modem Requirements

• Modem must support Hayes compatible command set (not
V150 or V151 = Microsoft command set)
• Modem must support alpha-numeric return codes
• Modem must follow serial baud rate of the CPU
• Modem must support auto-bauding (baud rate fall-back)
• When carrier detect (connect) is reported, the carrier must
be ON simultaneously at both modems (on CPU side and
on XBS side) ⇒ use same modem
• After a switch-on of the DTR line by the CPU or XBS, the
modem must accept a dial command after 3 seconds
• Modem must answer AT commands in less than 3
seconds

No Set-up for Standard Modem Behavior

If no special modem behavior is required, there is no need to
set up or initialize the modem/ISDN terminal adapter. The
Excel 50 Controller will automatically detect the device (MMI
or modem) attached to the serial port and set the appropriate
communication speed. The controller will also automatically
adapt to alphanumeric return codes used by the modem. This
automatic detection and adjustment can take up to 5
seconds.
NOTE: It is highly recommended to use a state-of-the-art
modem and leave it in its factory setting.

Automatic Baudrate Synchronization

The default communication speed between the Excel 50
Controller and the local modem/ISDN terminal adapter is 9.6
Kbaud.
The communication speed between the Excel 50 and XBS
modems/ISDN terminal adapters is automatically syn-
chronized by the two devices to the highest speed that both of
the devices are capable of. This feature is called autobauding
and is provided by all state-of-the-art modems / ISDN terminal
adapters when left in their factory default settings.
The communication speed between the XBS and its modem /
ISDN terminal adapter is part of the modem set-up at the
XBS.

Auto / Manual Answer Detection

The Excel 50 Controller will automatically detect whether the
modem/ISDN terminal adapter is initialized in auto-answer or
EXCEL 50 INSTALLATION INSTRUCTIONS
manual answer mode, and it will set the modem to the manual
answer mode (S0=0).

Resetting the Modem

For those cases where it is not clear if the modem to be used
is in its factory setting, the modem can be reset to its factory
setting by using the RESET MODEM command in the Start-
up sequence or through the HW Config. part of the System
Info. sequence on the MMI. This will allow a quick and easy
modem reset without having to run the modem set-up soft-
ware or the Windows™ terminal program.
The RESET MODEM command causes the following com-
mands to be sent to the modem:
1. ATZ: Executes hardware reset on modem
2. AT&FX3&W: Resets modem to factory configuration
settings, configures the modem to not wait for the public
phone system dial tone, and writes this to nonvolatile
memory.

Set-up for Special Modem Behavior

If special modem/ISDN terminal adapter behavior is required,
the communication device should be set up according to the
instructions provided with it. This typically involves running a
set-up program on a computer with the device connected to
the computer serial port or using the Windows™ terminal
program.

Set-up for In-house Telephone Systems

A common case of special modem behavior is when the
modem is connected to an in-house telephone network re-
quiring a prefix to be dialed before the destination number to
provide access to the public telephone network. There are
two important aspects of the special initialization of the
modem to consider:
1. Do not wait for the public network dial tone. Typically,
the init command ATX3 will trigger the modem to dial
without waiting for a public network dial tone. Save this
modem set-up in the modem EEPROM with the com-
mand AT&W. Check the modem handbook to verify the
correct commands. Note that these commands are
executed automatically with the RESET MODEM com-
mand in the Excel 50 Controller Start-up Sequence.
2. Add the prefix required for accessing the public tele-
phone network to the destination telephone number.
Depending on the in-house telephone system, a certain
prefix may have to be added to the destination number
in the XBS system configuration/site definition screen
before sending the set-up to the remote Excel 50 con-
troller.

Set-up for Limited Communication Speed

The communication speed of the modem can be fixed to a
lower rate in case of data transmission errors due to tele-
phone line limitations. See section "Start-up Sequence" or
see the Excel 50 User Guide, EN2B-0137GE51, for the
procedure for fixing the baud rate.
25 EN1B-0101GE51 R1105D