Troubleshooting A Communication Failure; Incorrect Wakeup Message - Teledyne WORKHORSE Operation Manual

May 2015
Only fuses with the required rated current, voltage, and specified type must be used. Do not
repair fuses or short circuit fuse-holders. To do so could cause a shock or fire hazard.
Do not install substitute parts or perform any unauthorized modifications to the instrument.
Measurements described in the manual are performed with power supplied to the instrument
while protective covers are removed. Energy available at many points may, if contacted, result
in personal injury.
Do not attempt to open or service the power supply.
Any maintenance and repair of the opened instrument under voltage should be avoided as
much as possible, and when inevitable, should be carried out only by a skilled person who is
aware of the hazard involved.
Capacitors inside the instrument may still be charged even if the instrument has been
disconnected from its source of supply.

Troubleshooting a Communication Failure

H-ADCPs communicate by means of two serial communication channels. The user can choose between
RS-232 and RS-422 classes of serial interfaces with a switch on the PIO board in the H-ADCP.
To successfully communicate, both the host computer and the H-ADCP must communicate using the
same class of serial interface. Standard serial interfaces in IBM compatible computers are also RS-232.
If you have just received your H-ADCP from TRDI, the standard configuration is RS-232 for
Sentinels and RS-422 for Monitors and Mariners.
If you are using a high baud rate and/or a long I/O cable (greater than 50 meters) connected to
a Sentinel H-ADCP, RS-232 may not work. Switch to RS-422 and try to wake up the H-ADCP
again.
Most communication problems are associated with incorrect cabling (i.e. the serial cable is
connected to the wrong port) or data protocols (i.e. the wrong baud rate is set between the H-
ADCP and computer).

Incorrect Wakeup Message

When you send a break and the wakeup message is not readable (garbled), this may indicate a communi-
cations mismatch or lost boot code.
•
Sending a break causes "garbage" to appear on the screen. The "garbage" text may keep scrolling.
This happens when the computer is using RS-232 and the H-ADCP is set for RS-422 or vice-versa.
Check the RS-232/RS-422 switch on the PIO board (see
• Sending a break causes "garbage" to appear on the screen. You can hear the H-ADCP "beep" when
the break is sent. The "garbage" text does not keep scrolling. Check that the H-ADCP and comput-
Page 84
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
WorkHorse H-ADCP Operation Manual
Communications Setting).