QTech Q23 User Manual

Q23 – DATRAN II eXcel I/O Expansion

Quick Start Guide

DATRAN II eXcel - Q23 Quick Start Guide – v2.0 – September 2010

Module Address

As an IO expansion module that communicates with the master RTU (eXcel or QRTU) on
the RS485 bus, the module must have an address that is unique to that bus. The
expansion module is factory preset to address 3. Therefore if multiple expansion modules
are to be used on the same RS485 bus then their addresses must be configured. This is
achieved by setting a code on the block of 8 DIP switches located internally to the IO
expansion module casing.

The code for address is a binary code with switch 1 being the least significant bit. This
means that each switch has a numeric value associated with it, and the resultant address
is calculated when you add all the switch values that are in the “ON” state.

The module address can be any number between 1 and 239. The module address 0 is a
reserved address while module address 255 is used to re-load the factory default
configuration settings.

The value of each switch is as follows:

Module Address Switch Values

Switch Number 1 2 3 4 5 6 7 8

Value 1 2 4 8 16 32 64 128

For example, if a module needs an address of 22, the correct setting would be to have
switches 2,3 and 5 on and the rest off. (2+4+16 = 22).

The back of the Q23 Users Guide has a full table of all valid addresses and their
corresponding DIP switch settings.

Status LED’s

ON : This LED is always on when the module is powered.
OK : This LED flashes on a 1 second cycle to show the CPU has not locked
up. If it is on solidly or stays off, then the eXcel needs attention.
IP : This LED indicates that the module is currently sending comms out its

IPB port to communicate with the RTU.

ER : This is the Error Indication LED. The LED will flash a certain number of

times to indicate any error messages the module has been configured
to display from Q90.

Number of

Flashes

Message

4 5 6

IPB

Comms

Fail

Digital

Outputs

Fail

Analog

Inputs

Fail