DATASONICS PSA-916, User Manual, Page: 24 / 26

4-5 DATASONICS
User’s Manual March 1997
4.4.2 Test Points
TP1 Detector: normally a logic 1 (5 VDC), whenever a transmission or a
received echo is detected the line goes to a logic 0 (0vdc) for the
duration of the detection.
TP2 Transmit Pulse: normally a logic 1 (12 VDC). During transmit a train of
1.8us pulses at the transmit frequency.
TP3 Oscillator during Transmit cycle, and amplified output of the receiver.
Note that the scope capacitance will alter the signal.
TP5 Transmitter Key: Normally 0 VDC, during transmit it is at 0.6 VDC
lasting for 250us.
TP6 2.5 VDC
TP7 Analog Output
TP8 12 VDC
TP9 5 VDC
4.4.3 Error Message
If Error message E1 is continuously output, it means the receiver is unable to
detect the transmission of the transmitter. Check that Jumper JP1 is installed,
and that the ground wire from the end cap to J2 is connected. Otherwise the
most likely source of the failure is U1 or its associated components.