CHAPTER 4: SYSTEM ADMINISTRATION SYSTEM ADMINISTRATION
MULTINET4 MULTI-PORT SERIAL SERVER & MANAGED SWITCH – INSTRUCTION MANUAL 4–83
4.5.3.2 Fixed Mappings
Allows the user to enable fixed mappings between serial ports and Modbus/TCP ports.
This screen is used to define the directly connected Modbus Master devices. The
parameters are defined as follows:
Field Name Field Value
Modbus Management Whether or not the Multinet4 memory map is accessible
Management Address The Modbus device address used to access the Multinet4
memory map
Field Name Field Value
Port ID Identifier of the serial port to which the device is connected.
Protocol Variant Specifies the protocol variant spoken by the device
• RTU: messages are binary encoded with CRC and begin
with a silent interval of 3.5 character times (Default).
• ASCII: messages are ASCII encoded with LRC and begin
with a ‘:’ character and end with a CRLF sequence.
Priority (DiffServ) Each IP packet generated by this device will be assigned a
DiffServ marking based on the priority set by the user. The
priorities are:
• Default: Best Effort Service (Code Point 0) (Default).
• Expedited: Expedited Forwarding (Code Point 0x2E)
(RFC2598).
Response Timer The amount of time to wait for a response from this device before
giving up and sending back a Modbus exception message.
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