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1 - 16 Modular LYNX System 12.05.2003
Section 5
The Communications Interface
Section Overview
The LYNX Control Module features two communication interfaces: RS-232 and RS-485. For both channels,
the BAUD rate is software configurated, using the BAUD variable, to 4800, 9600, 19200 or 38400 bits/sec.
The factory default is set to 19200 bits/sec. Default data settings are 8 data bits, 1 stop bit and no parity.
A host computer can be connected to either interface to provide commands to the control module or to
multiple control modules in a system. Since most personal computers are equipped with an RS-232 serial
port, it is most common to use the RS-232 interface for communications from the host computer to the
control module. You will typically want to use this interface option if your Host PC will be within 50 feet of
your system. Should your system design place the LYNX Control Module at a distance greater than 50 feet,
it will be necessary for you to use the RS-485 interface option. You can accomplish this by using either an
RS-232 to RS-485 converter, such as the converter sold by IMS (Part # CV-3222), or installing an RS-485
board in an open slot in your host PC.
Covered in detail in this section are:
! RS-232 Interface, Single Control Module System.
! RS-232 Interface, Multiple Controller System.
! RS-485 Interface, Single Control Module Interface.
! RS-485 interface, Multiple Controller System.
! Communicating with the LYNX System using Windows95/98 HyperTerminal.
! Communicating with the LYNX System using the IMS Terminal software.
! LYNX Control Module Modes of Operation.
! LYNX Control Module Communication Modes.
Connecting the RS-232 Interface
Single Control Module System
In systems with a single control module, also referred to as Single Mode, the LYNX Control Module is
connected directly to a free serial port of the Host PC. Wiring and connection should be performed in accor-
dance with the following table and diagram. In this mode the PARTY switch will be in the OFF position, and
the PARTY Flag will be set to 0 in software. This is the factory default setting. Please be aware that you
cannot communicate with the LYNX Control Module in single mode unless those conditions exist.
NOTE: If using the RS-232 Interface Option, the Host PC MUST
be less than 50 feet from the Control Module. If your system
will be greater than 50 feet from the Host PC you must use the
RS-485/RS485 Interface.
N
!
WARNING! Failure to connect communications ground as
shown may result in damage to the Control Module and/or
Host!