![]() If only the Tx LED is lighting, the unit is not really sending strings. ![]() You should see both LEDs light when each command is sent. Send a command and watch the Tx and Rx (receive) LEDs. Once you have a good response from the Tx LED, short pins 2 and 3 on the DB-9 or phoenix connector on the port. See later in the document for a discussion of handshaking. Sending an 'HSOFF' command to the device port does this. If your device does not use hardware handshaking be sure handshaking is disabled in the port. If you do not see the Tx LED, you must first correct your code, or configure the hardware properly. You should see the Tx (transmit) LED light. Send a string by pressing a TP button to send a command use Open Axcess, NetLinx Diagnostics or a terminal emulator. First, make sure that your code and/or hardware are sending strings.
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