Users Manual

MDS 05-6399A01, Rev. G MDS™ Master Station 51
not send a response until it also has data to send. This is the preferred mode when no
other network monitoring systems are being used.
- Silent – In Silent mode, the unit transparently sniffs DLINK messages that are already
on the network rather than send out its own. This is useful in a network where DLINK
diagnostics are already in use by other devices or network monitoring systems.
• Polling Interval (Passive mode only) – This value specifies how often a broadcast
message should be sent to detect radios. Range: 0 – 4294967295, default 5.
IP Payload
Under the IP Payload menu, up to three instances of the IP Payload service may be configured.
The IP Payload service can operate in 4 different modes:
- TCP Server
- TCP Client
- TCP Server/Client
- UDP
Common Options:
- Enabled – Set to true to enable this IP Payload configuration.
- IP Payload Mode – The mode in which this instance of the IP Payload service should
operate. The details of these modes are shown below.
- Talk on VRC – (Only in packet-with-mac mode) The Virtual Radio Channel that data
from this IP Payload instance will be tagged with when transmitted over the air.
- Listen to VRC – (Only in packet-with-mac mode) Over-the-air data tagged with this
Virtual Radio Channel will be handled by this IP Payload instance.
- Modbus TCP RTU Conversion – (Does not apply to UDP mode) When enabled, the IP
Payload server will convert packets between MODBUS TCP and MODBUS RTU
formats.
- Inactivity Timeout – When set to a value larger than 0, the connection will be closed after
the specified number of seconds without any data activity.
Each of the IP Payload modes have different use cases and configuration options, as described
below:
TCP Server:
The TCP server mode allows IP connections to be established with the Master Station. Data re-
ceived on this TCP socket will be transmitted over the air to remote SD radios as if the data was
received on the payload serial port of the Master Station. Over-the-air serial data originating
from a remote SD radio will be transmitted out of this TCP socket. This mode of operation can
be thought of as a ‘remote terminal server’, not to be confused with the SD remote radio’s Ter-
minal Server functionality.