General Dynamics CG-1220, Operation And Maintenance Manual

Page: 42 / 134

Operation
4-10 CG-1220 DTR

PORT 1, PORT 2 – These two menus configure the port for M&C
communications. Port 1 is RS-232 only, while Port 2 allows RS-232 or RS-
422 connections. See Table 3-6 for factory set data parameters for these
ports. The following submenus are configurable for M&C communications:

BPS (BAUD) –
The transfer rate of Port 1 can be set from 1200 to
57,600 BPS. The transfer rate of Port 2 can be set from 1200 to
115,200 BPS.

NEWLINE – When enabled, a carriage return line-feed (CR-LF) is sent at
the end of the command line. When disabled, only a carriage return (CR)
is sent.

ECHO
returns the received character to the port.

SHELL
determines the communications protocol used on this serial port.
DISABLED disables the serial port. M&C SHELL provides Monitor and
Control protocol support including status polling and system configuration
capability. 72xx M&C Shell provides TRL Monitor and Control protocol
support for status polling and system configuration by a 72xx ACU with
version 2 firmware. An ACU remote port set to DTR and a DTR set to
72xx M&C SHELL will NOT communicate. MESSAGE PRINTER is a
diagnostic tool which may be used to record system events when
connected to a terminal program or a serial printer. TBT INTERFACE
(Optional) supports serial control of GDST Tracking Band Translator
(TBT).

RESET PORT resets the given port. The communication interface is
reinitialized and the shell (if any) that was running on it is restarted.

PORT 3 – This menu configures the RS-485 Port 3 for M&C
communications. See Table 3-9 for factory set data parameters for this
port. The following submenus are configurable for M&C communications:

BPS (BAUD) –
The transfer rate of Port 3 can be set from 1200 to
115,200 BPS.

SHELL determines the communications protocol used on this serial port.
DISABLED disables the serial port. M&C SHELL provides Monitor and
Control protocol support including status polling and system configuration
capability.

MASTER ADDRESS
is the address of the master (controlling) device on
the multi-drop RS-485 bus. There are a maximum of 32 addresses,
ranging from 0 to 31. On the bus, the actual ASCII value used for
addressing is the address assigned here plus the value of the parameter
ADDRESS OFFSET.