Remote Hmi Connected Via A Modem To The Electro-Optical Converter - ABB REG316 4 Series Operating Instructions Manual

ABB Switzerland Ltd
Fig. 5.72
5.12.4.2. Remote HMI connected via a modem to the electro-optical
converter
COMT=MDM enables several devices to be controlled in an
SPA-BUS loop via a modem. A suitable electro-optical converter
(SPA-ZC22) must be inserted between the SPA-BUS loop and
the modem.
Providing synchronisation is enabled, the clocks in the devices
are synchronised to the PC clock by a broadcast telegram when
the remote HMI is started.
A genuine hardware handshake with the remote modem is not
possible in this mode and the DTR signal is therefore not set.
The modem handshake must be switched off and the DTR line
ignored. The line baud rate must not be higher than that of the
SPA-BUS.
Modem settings:
DTR = ignored
Handshake=off
Consult the manual supplied with your modem for the modem
parameters.
5-96
RS232
ELECTRO/OPTO
CONVERTER
R
R
Units Bay
Units Bay
C
E
Remote HMI connected directly to an electro-
optical converter
REG 316*4 1MRB520049-Uen / Rev. E
SPA
Tx
Rx
R
Units Bay
C
E
HEST953001 C
C
E