SEA 7157 Operator's Manual page 45

REAR PANEL
REAR PANEL CONNECTIONS
(cont.)
RS-232 COMPUTER INTERFACE - P4:
The P4 connector allows a computer to be interconnected to the radio for
updating the radio's flash ROM.
Pin 1 - No Connection
Pin 2 - RXD Serial data RECEIVER pin for RS232 port.
Pin 3 - TXD Serial data TRANSMITTER pin for RS232 port.
Pin 4 - No Connection
Pin 5 - RS232 port ground pin.
Pin 6 - DSR (Data Set Ready)
Pin 7 - RTS (Request To Send)
Pin 8 - CTS (Clear To Send)
Pin 9 - No Connection
GROUND LUG:
Chassis ground (earth) connection. The chassis should be connected to the
ship's earth connection for safety purposes. This connection will also help
reduce RF interference problems both from the SEA 7157 as well as other
equipment interfering with the SEA 7157.
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