Woodward MRM4, Manual

Page: 190 / 460

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.
Only available if:Device
planning = RTU.
8E1,
8O1,
8N1,
8N2
8E1 [Device Para
/Modbus]
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]
Scada CmdBlo Activating (allowing)/
Deactivating (disallowing)
the blocking of the Scada
Commands. inactive,
active
inactive [Device Para
/Modbus]
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]
Page 190 EN MRM4 01/11