WI-GTWY-9-xxx Wireless Gateway V1.18
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2.3
Database
The WI-GTWY-9-xxx database (Radio Interface) has 10 000 registers, each of 16 bit size. The
structure of the database is:
Registers
Purpose
0 - 4299 I/O registers
4300 - 4399 On-board I/O
4401 - 4499 Comms-fail status and radio strengths for remote modules
5000 - 9499 Status registers - 16 bit status for each I/O signal
9500 - 9999 Status registers for block read/write messages
The register numbers may be used by the Host Protocol Driver to access I/O values and I/O status
information. Each configured I/O point has a 16 bit value (in registers 0000 - 4299), and a 16 bit
status value. The status register is located at 5000 plus the I/O value register. For example, an
I/O point in register number 2560 has a status value in register number 7560 (5000 + 2560).
Details of the status register are provided in Appendix A. The most important part of the status
register is the 15
th
or most significant bit - this indicates comm-fail status for the I/O register. If
the most significant bit is set, then the I/O register is in comms-fail.
The host device can read the status registers. For example, the communications status of an
output configured at register number 3001 can be examined by reading register number 8001
(5000 + 3001). If the register value is greater than 32767, then the 15th bit is set, indicating that
the output has a communications failure.
2.3.1
On-board I/O and Internal I/O
The WI-GTWY-9-xxx has eight discrete I/O points. These may be used as inputs or as outputs.
Inputs are linked to registers 4300-4307. That is, if a contact connected to DIO1 is “on”, then
register 4300 is given an “on” value. The inverse of the input values are stored in registers 4370-
4377.
Outputs are controlled from registers 4320-4327; that is, if register 4327 is set to an “on” value,
then output DIO8 is activated.
Whenever an output register is set “on”, the corresponding input register is automatically set
“off”. For example, if register 4321 is set to “1”, the WI-GTWY-9-xxx will also set 4301 to “0”.
This means that if both the input and output registers corresponding to the same I/O point are
used in the configuration, then the output register has priority.
Outputs may be written to by either the host device or by a remote WI-I/O 9-x via the radio port.
Input values can be sent to the host device or to a remote module via the radio port.
