User manual

905U Wireless I/O Module User Manual
105S Serial I/O Module
Page 34 © October 2001
Chapter Four CONFIGURATION
4.1 Introduction
The modules are configured by connecting a computer (PC) using the Configuration Software program.
The same software program is used to configure 905U-C modules - for more information, refer to the
separate 905U-C User Manual. Each module is configured with a system address and a unit address.
The system address is common to every module in the same system, and is used to prevent "cross-talk"
between modules in different systems. Separate networks with different system addresses may operate
independently in the same area without affecting each other. The system address may be any number
between 1 and 32 767. The actual value of the system address is not important, provided all modules
in the same system have the same system address value. A system address of zero should not be
used. The use of a random number is recommended.
Each unit must have a unique unit address within the one system. A valid unit address is 1 to 127. A
network may have up to 95 addresses communicating via radio (unit addresses 1 to 95), each with up
to 31 modules communicating via RS485 (unit addresses 96 to 127). In the network, any individual
input signal may be "mapped" to one or more outputs anywhere in the system. The unit address
determines the method of communication to a module. Any module with a unit address between 96
and 127 will communicate by RS485 only. Other units with a unit address below 95 may communicate
by radio or RS485 - the unit will determine which way to communicate depending upon the unit
address of the destination module. For example, Unit 31 will talk to Unit 97 by RS485 only, but will
talk to unit 59 by radio only. 105S units must always have a unit address between 96 and 127 as serial
communication is the only method of communication available. A unit address of zero should not be
used.
The four different I/O versions in the range can be used together in the same system. 905U-C modules
can also be part of a system. Inputs to one product type can be transmitted to outputs of another
product type. For example, an analog input to a ”-2” may be transmitted to an analog output of a ”-1”
or ”-3”. Repeaters may be any product type.
The ”-1” and ”-2” modules require only one unit address. The ”-3” and ”-4” modules use two
addresses, however only one unit address has to be entered. The ”-3” and ”-4” modules require two
addresses because of the large number of output channels. If the “entered" unit address is an even
number, then the second address is the next number. If the "entered" address is an odd number, then
the second address is the previous number. So the two addresses are two subsequent numbers, starting
with an even number. If a ”-3” module is given a unit address of 10, then it will also take up the unit
address 11 and will accept messages addressed to either 10 or 11. It is important to remember this
when allocating unit addresses to other modules in the system.
Warning - do not allocate the address number 1 to a “-3” or “-4” module.
In addition to these network configurations, operational parameters called User Options may be
configured to change the features of the operation.