Manual

20639-01 Rev 03

9.2 Transmitter Output Definitions

The following figure shows a diagram of the output portion of the

terminal board. The outputs of the transmitter are connected to

communicate between the transmitter and other equipment.

Figure 44 Transmitter Output Terminals

COMM – This denotes the connection point for serial digital

communications. Either RS232 or RS485 communications is

supported with baud rates settable between 2400 and 115200 baud (8

bits, no parity, 1 stop bit). The communications type (RS232/485) as

well as the baud rate can be set by the front panel keypad as listed in

a later section of the manual.

Note: If intermittent RS-485 communication problems are observed, it

may be necessary to put bus terminations of 120 ohms at the extreme

ends of the bus between COM+ and COM-. Should this be

necessary, follow best practices in selecting the resistor and in

connecting it reliably to the bus.

However, it is a violation of Class I

Division 2 rating of the SONARtrac

transmitter to install the bus

termination resistor physically within this enclosure. A different

Class I Division 2 enclosure must be used to house the bus

termination resistor if the SONARtrac

transmitter is installed in

a Class I Division 2 location.