Campbell Scientific VSP3 Vosponder Voice Radio Interface - Manual (Page 40)

Section 5. Testing and Troubleshooting
5-4
4. Open the Ports/Flags window and watch to see if the control
port that you have wired the Vosponder’s SDI-12 interface
cable into ever goes high (green dot). The port must go high
in order for data to be transferred to the Vosponder. If it
doesn’t, then you will need to check your program and/or the
datalogger’s control port to see why the control port is not
working.
Problem: The Vosponder transmits fine on interval transmissions, or
when I issue a “Speak Now” command, but it doesn’t respond
when I key in the DTMF code from a handset.
Solution: There are two possible reasons for this problem.
1. You are not keying in the DTMF code that the Vosponder is
expecting.
2. Each radio has small variances that can, in some cases, make
a difference. You will need to test your DTMF decoding.
Both of these solutions can be checked fairly quickly by doing
the following:
1. Connect the Vosponder to a computer using a null modem
cable.
2. Make sure the radio is plugged in to the Vosponder
3. Make sure the Vosponder has at least 10 VDC of power
applied to the +12 VDC SDI-12 terminal.
4. Initiate communication using a terminal program such as
HyperTerminal. (Refer to Section 4.) At the main menu
prompt (M:>), issue a (V)iew command by pressing “V”,
and then enter a “A” to see the current DTMF code. If this
is the same code you have been keying in, then go to the
next steps.
5. At the V:> prompt, enter a “D”. The screen will do a hard
return and the word Bye! will be displayed. The Vosponder
is now in a listening mode where the corresponding number
associated with any DTMF tones from the radio handset
should be displayed on the PC screen.
6. Hold down the push-to-talk button on the handset and press
various numeric keys on your keypad. You should see the
corresponding number displayed on the PC. If the numbers
are not decoding correctly, or if multiple instances of the
same number are appearing, minor adjustments to the
Vosponder will need to be made. Refer to Appendix C for a
detailed explanation of how to make adjustments to the
Vosponder in order to fix this problem.