Woodward highprotec MRI4, User Manual

Page: 194 / 727

Communication Protocols
Parameter Description Setting range Default Menu path
Physical
Settings
Digit 1: Number of bits. Digit 2: E=even
parity, O=odd parity, N=no parity. Digit 3:
Number of stop bits. More information on
the parity: It is possible that the last data bit
is followed by a parity bit which is used for
recognition of communication errors. The
parity bit ensures that with even parity
("EVEN") always an even number of bits
with valence "1" or with odd parity ("ODD")
an odd number of "1" valence bits are
transmitted. But it is also possible to
transmit no parity bits (here the setting is
"Parity = None"). More information on the
stop-bits: The end of a data byte is
terminated by the stop-bits.
8E1,
8O1,
8N1,
8N2
8E1 [Device Para
/Modbus
/
Communication
/RTU]
t-call If there is no request telegram sent from
Scada to the device after expiry of this time
- the device concludes a communication
failure within the Scada system.
1 - 3600s 10s [Device Para
/Modbus
/
Communication
/General
Settings]
Scada CmdBlo Activating (allowing)/ Deactivating
(disallowing) the blocking of the Scada
Commands
inactive,
active
inactive [Device Para
/Modbus
/
Communication
/General
Settings]
Disable
Latching
Disable Latching: If this parameter is active
(true), none of the Modbus states will be
latched. That means that trip signals wont
be latched by Modbus.
inactive,
active
inactive [Device Para
/Modbus
/
Communication
/General
Settings]
AllowGap If this parameter is active (True), the user
can request a set of modbus register
without getting an exception, because of
invalid address in the requested array. The
invalid addresses have a special value
0xFAFA, but the user is responsible for
ignoring invalid addresses. Attention: This
special value can be valid, if address is
valid.
inactive,
active
inactive [Device Para
/Modbus
/
Communication
/General
Settings]
194 MRI4 DOK-HB-MRI4-2E