JUMO LOGOSCREEN nt Interface Description page 34

5 Serial protocol types
Modem
parameters
Internet
dial-up
34
The following INIT string is required for operation as a Modbus
slave via modem:
AT&FE0X3Q1&K0S0=1&D0&W0&Y0
AT&F = load present manufacturer profile
E0 = switch off character echo
X3 = switch off fixed dial tone selection,
switch on busy tone selection
Q1 = switch off command responses
&K0 = switch off data flow control
S0=1 = automatic pick-up after first ring
&D0 = ignore DTR signal
&W0 = save present configuration as profile 0
&Y0 = use user profile 0 after switch-on
The dial-up/hang-up strings are only required if one of the modem
alarms is activated.