XBee RS232 PH Adapter

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Overview

The Digi Xbee RS-232 PH (Power Harvesting) Adapter is a wireless to RS-232 adapter which draws power from the attached RS-232 port, slowly charging a super-cap which functions as a short-term battery. It does not require sleeping, however it can only actively transmit from 5% to 20% of the time, which means it must be idle from 80% to 95% of the time to allow the super-cap to recharge between radio transmissions. Unfortunately the exact duty cycle of operation (or percentage of time sending/receving RF packets) is defined by the device to which the XBee RS-232 PH is connected.

In general the Digi Xbee RS-232 PH Adapter functions identically to the Digi XBee RS-232 Adapter, so refer to the Digi XBee RS-232 Adapter page for most programming questions.

Features which are the same:

  • The same 9-pin DTE port, matching a standard PC computer including support for DTR/DSR, RTS/CTS, CD and RI

Features which are different:

  • No support for the Auxillary Power Out on pin 9 / RI.
  • Draws power from DTE inputs RXD, DSR, CTS, CD, RI; can be either high or low (either V+ or V-)
  • Cannot 'talk' 100% of the time - a general rule of thumb is one poll-response per second.
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