I-O Display Systems Basic I/O Product - Manual (Page 75)

Setup 3
3-2(Vol.2)
Function Abbrev. Function
Address Sequential Display
Master Unit Control MC 00h (0) UO=00
Master Unit Digital I/O MD 40h (64) U1=40
Master Unit Analog I/O MA 80h (128) U2=80
The OFFSET addressing mode is more convenient to use as only one address setup is required
for each network connection. For example changing the master unit control MC, from 00h to
03h will automatically cause MD=43h; MA=83h.
Variable Mode
In the variable mode function addresses are independent of each other and can range from 00h
to Ffh. For this mode, each function, MC, MD, and MA must be entered. As long as addresses
are not duplicated, they can take on any of the 256 possibilities. The variable mode must be
used with some software packages and systems of more than 64 BASIC I/O AD network
connections.
The loading of selected function addresses into the BASIC I/O AD is explained after the
description of analog / digital separator, baud rates, and protocol handshake type.
Analog/ Digital separator:
Each BASIC I/O AD will require an analog/ digital separator to be set. This identifies which
modules are analog and which are digital. This is necessary so that the system can properly
direct each instruction to the appropriate module.
The analog/ digital separator is the character following the 9 in the sequential display. It
should be set equal to he HEX value of the lowest numbered module position containing a
digital module (input or output). If this BASIC I/O AD contains only analog modules, set this
value to G. Refer to the worksheet .