905U-G Wireless Gateway
User Manual
Page 61
©September 2004
4.4.8
“Repeater-only” Configuration
Any 905G module can act as a repeater unit.
However a 905G may need to be installed as a
repeater only (that is, there is no host device
connected). In this case, the base 905G, the 905U-
G-MD1 unit would normally be used as this is the
lowest cost of the 105G modules.
A repeater can be configured as a “Repeater-only”
unit. The advantages are:
the serial port will then provide on-line diagnostics (instead of off-line diagnostics), or
105S serial I/O modules can be connected to the serial port - normally 105S modules
cannot be used with MD1 units.
4.5
Change Sensitivity
“Change” messages for both individual I/O mappings and block mappings use a sensitivity
value to trigger the message. Sensitivities are configured for blocks of I/O registers - that is,
each I/O register does not have a unique sensitivity. You can configure up to 50 sensitivity
values - that is, there can be 50 blocks of registers with different sensitivities.
In the above example, three sensitivity blocks have been configured:
1.
I/O registers 0 – 49 have a sensitivity of 1000 (or 1.5% of the 16 bit range)
2.
I/O registers 100 – 499 have a sensitivity of 250 (or 0.4% of the 16 bit range)
3.
I/O registers 1000 – 2999 have a sensitivity of 100 (or 0.15% of the 16 bit range)
All of the registers between 0 and 49 have a sensitivity value of 1000. If register 34 has
changed value by more than 1000 since the last transmission for that register, then a change
