iSMA-B-W0202 Modbus User Manual
version 1.2
Page 16 / 49
the question. This time is used to extend the interval between question and answer. The default
value of 0 means no delay (the answer is sent once during the 3.5 character required by the
protocol Modbus RTU).
Watchdog time (40141)
This register specifies the time in seconds to watchdog reset. If module does not receive any valid
message within that time, Digital Outputs will be set to default state, which is determined by
value in 40142 register.
This feature is useful if for some reason there is an interruption in data transmission and for
security reasons output state must be set to the appropriate state endanger the safety of persons
or property.
Setting of 0 value will disable the watchdog. The default value is 15 seconds.
Watchdog for Radio
If the radio does not receive the correct data packet for 180 seconds, the radio module will restart.
Time 180 seconds is a constant value.
Radio configuration registers
WARNING!
Changing the parameters concerning the transmission configuration will only take
effect after restarting the module or reload settings –register (40001).
Radio TX Power (40242)
This register contains radio transmission signal power. The signal strength depends on the
distance between devices and the environment conditions.
Value
Radio TX Power [dBm]
Radio TX Power [mW]
0
-18
0,0158
1
0
1
2
7
5
3
10
10
4
14
25
5
17
50
6
20
100
Table 10 Radio TX Power register
Radio Channel (40243)
This register contains information about a radio channel. All modules which work in the same
group require the same channel number. More than one wireless network can be used but each
of them has to work on different channel. Each channel has to have no influence on each other
(see chapter
Radio Baud Rate
).
Value
Channel
Frequency
0
DISABLE
-
1
Channel 1
869,415 MHz
2
Channel 2
869,445 MHz