User manual -
ATR144- 39
9.2
Master
The device works as master if value selected on parameter
160
mb.ma.
is other than
disab
.
9.2.a
Master mode in retransmission
In this mode the device may write up to two values on a target
(slave) with ID equal to the value set on the parameter 161
ta.AD.
(“Target Address”). BaudRate and serial format will have
to be set on the parameters 162
ma.b.r.
(“Master Baud Rate”)
and 163
m.s.p.f.
(“Master Serial Port Format”). The variables
to be resent are chosen on the parameters 164
var.1
and 169
var.2
: the addresses for reading/writing the variables should
be set on the parameter 165
v.1.ad.
(“Variable 1 Address”) for
variable 1 and parameter 170
v.2.ad.
(“Variable 2 Address”) for
variable 2. For resending the setpoints (parameters 164
var.1
or
169
var.2
set to
r.w.c.se.
or
r.w.a.1.s.
) after writing on the slave,
the ATR144 starts reading the word that has been chosen:
in this way any change of the slave value is also registered
by the master. Two subsequent queries are delayed by the
time set on the parameter 174
tr.de.
(“Transmission Delay”),
while the response from the slave is expected for a max.
time set on the parameter 175
re.to.
(“Reception Timeout”).
The following table shows the choices which allow the master
operation during resending.
