ProSoft Technology 5202-DFNT-MCM4 - Manual (Page 26)

MCM ♦ ProLinx Gateway MCM Protocol Configuration
Modbus Master/Slave Driver Manual
Page 26 of 80
ProSoft Technology, Inc.
October 16, 2009
3.1.26 Error Delay Counter
0 TO 65535
This parameter specifies the number of poll attempts to be skipped before trying
to re-establish communications with a slave that has failed to respond to a
command within the time limit set by the Response Timeout parameter. After the
slave fails to respond, the master will skip sending commands that should have
been sent to the slave until the number of skipped commands matches the value
entered in this parameter. This creates a sort of slow poll mode for slaves that
are experiencing communication problems.
3.1.27 Command Control Reg
0 TO 3900
This parameter allows you to control the execution of commands in the
Command List (page 27) by setting a value of zero (0), one (1), two (2), or three
(3) into a 100-register area of the gateway database, beginning at the address
entered in this parameter. If a user defines commands in the list with an Enable
(page 28) code of zero for all commands, no commands will execute. If the value
in the first control register is changed to one (1), command zero will execute
continuously. If the value is the control register for a write command is set to two
(2), the command will be enabled for conditional writing, which will cause the
command to execute whenever the values in the database registers associated
with the command change. Use the value of three (3) only for bit-level write
commands, FC 5 and 15. If the parameter is set to three(3), the command will
execute only if the internal bit data associated with the command changes. It will
also clear the bit or bits in the internal database after the write command is built.
This Command Control feature can be disabled by setting this parameter to a
value of-1 or by omitting the item name from the configuration file, resulting the
gateway to using a default value of -1.