Loopback repeater and buffer sizes

The loopback mode (store and forward) repeater will work with all versions of firmware on all Digi radio modems. It is important to keep in mind, though, that the Data In (DI) buffer size on our modules has changed with firmware versions. This can affect the amount of data a repeater is able to store and forward.

Following are the approximate buffer sizes:

Modem Version Buffer size
9XTend all 4K bytes
XStream v4.29B+ 1K bytes
  v4.25 500 bytes
  v4.24 300 bytes
  v4.15 130 bytes
9XCite all 438 bytes
XBee/XBee-PRO all 200 bytes

For the Loop Back adapter to work properly with RS-232, only pins 2 (RXD) and 3 (TXD) need to be shorted together. You may use a bent paper clip in place of the Loop Back adapter.

Relevant Files

Last updated: Aug 23, 2017

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