Chapter Two
Operation
MAN_905G_1.16
Page 22
voltage is also monitored, and an alarm is available at register 4309. This becomes active if
the supply voltage falls below 8.0V, and clears when the supply voltage rises above 9.0V.
I/O Register
Description
I/O Register
Description
4300
Input value DIO 1
4320
Output value DIO 1
4301
Input value DIO 2
4321
Output value DIO 2
4302
Input value DIO 3
4322
Output value DIO 3
4303
Input value DIO 4
4323
Output value DIO 4
4304
Input value DIO 5
4324
Output value DIO 5
4305
Input value DIO 6
4325
Output value DIO 6
4306
Input value DIO 7
4326
Output value DIO 7
4307
Input value DIO 8
4327
Output value DIO 8
4308
Low battery voltage status
4309
Supply voltage fail status
4310
Battery voltage value
4311
Supply voltage value
2.4
The Host - 905G Link
For the host device, the 905G "looks" like a single device (or a "virtual PLC"), containing the
I/O for the complete wireless I/O system.
DATABASE
I/O
"VIRTUAL PLC"
DATA-BUS
“HOST DEVICE”
905U-G
2.4.1
Modbus / DF1
The user selects whether the 905U-G-MD1 should act as a Modbus Master or Modbus Slave
or DF1 device.
The data type and baud rate of the serial communications must be configured at the 905G to
match the host. Data types can be 7 or 8 bit, even/odd/no parity, with 1 or 2 stop bits. Data
rates can be 300 - 19200 baud.
The full 905G database (4300 registers) can be accessed by the Host Device.