User guide

set ia
132 Chapter 2 Command Descriptions
permit={all|readonly|rdwrdata} (Modbus only)
Allows the Digi device to block or allow specific Modbus commands.
Since more than one Modbus master can be defined, you can use
standard network firewalls to enable “safe” incoming Modbus/TCP paths
that cannot modify device memory.
all
Allows all commands through the Digi device. Nothing is blocked.
readonly
Only commands that read normal operational data are allowed
through the Digi device. All writes or special commands are blocked.
Only Modbus commands 1-4 are allowed.
rdwrdata
Only commands that read or write normal operational data are allowed
through the Digi device. All special commands are blocked. Only
Modbus commands 1-6, 15, and 16 are allowed.
The default is "all."
priority={high|medium|low}
Enables a serial master to have adequate bandwidth, which is critical if a
Digi device is added in pass-through mode to share serial devices
between a serial master and network masters. Since up to 64 network
masters could compete with a single serial master, without a priority
setting, the serial master could get less than 2 percent of the bandwidth.
For example, set the serial master to “high” and the network masters to
“medium.”
high
A high-priority master can get up to 50 percent of the bandwidth–of
course you cannot have too many high-priority masters. All high-
priority masters get one message serviced before any low or medium
priority masters get any service.
medium
If a high-priority master exists, then one medium-priority master gets
one message serviced before all the high-priority masters are serviced
again. If only medium-priority masters exist (which is the default
setting), then all masters are serviced in a round-robin manner.
low
Low-priority masters only get service when no high- or medium-priority
master has messages to service.
The default is "medium."
range
The slot in the table of masters. Used to select one or a range of master
entries to display or configure.
table (applies to master only)
Defines which table is used to route messages to their destination. This
applies only to master-attached devices.