Specifications

Channel Master Operation Manual
P/N 95B-6001-00 (February 2006) page 11
NOTE. The RS-232 to RS-422 converter supplied with the Channel
Master is powered by the computer’s COM port. It may be necessary to
use a different converter when very long communication lines are used
(maximum 1300 meters).
I/O CABLE
12 VDC BATTERY
or POWER SUPPL
Y
To COMPUTER
SERIAL PORT
H-ADCP
BBTalk
RED = Pos (+)
BLACK = Neg (-)
BLACK = GND
BLUE = SDI12
Figure 7. Channel Master Connections with SDI12
4.1 Power Requirements
The Channel Master requires a DC supply between 10 volts and 18 volts.
Either an external DC power supply or battery can provide this power. If
you are using a battery, use the largest rated amp-hour battery as possible.
A fully charged 48Ah battery should last five days powering a 600-kHz
Channel Master.
NOTE. Check that the battery voltage is above 10 Volts DC. Channel
Masters will work at 10 volts; however, batteries with voltages below 11
volts are at or near their end of life and are approaching uselessness.
4.2 What if the Channel Master Does Not Respond
If your Channel Master does not respond, check the following items.
a. Is the I/O cable connected from your computer’s COM port to the
Channel Master?
b. Is power connected to the Channel Master I/O Cable?
c. Check the communication setup using BBTalk. See the RDI Tools
User’s Guide for detailed help on using BBTalk. The computer and the
Channel Master must be using the same baud rate and COM port.
d. If wakeup still does not occur, contact RD Instruments.