Varec 4000 manual Model 1200 Error Messages, Host Communication Loopback Tests

Maintenance and Troubleshooting Tank Gauge Transmitter

4.6Model 1200 Error Messages

The following error messages can be encountered while using the Model 1200.

Error Message Description

INVALID ANSWER	The operator was expected to enter either a 'Y' for yes
	or an 'N' for no and something different was entered.
INVALID FLOAT	The operator entered an invalid floating point number. The
	proper format for floating point entry is
	[spaces][sign]number['.'][number]['E'][sign][number]
	where the fields surrounded by brackets([]) are optional.
	Leading spaces are permitted, however spaces within the
	number are not allowed. A maximum number of 15 characters
	is allowed. The exponent (value after 'E') cannot be larger than
	30 nor less than -30.
INVALID INPUT	The operator was given a choice of two different
	characters to enter and something else was entered.
INVALID NUMBER	The operator entered an invalid number.
NEGATIVE NUMBER	The operator entered a negative number when asked for
	a positive float number.
NOT ALTERABLE	The operator attempted to alter a Command,
	Informational, or Menu Item using the F3 (alter) key.
NOT IN ALTER MODE	The operator attempted to alter a Configuration Item
	using the F3 (alter) key while in the Display Mode.
TOO MANY CHARACTERS	The operator attempted to enter more than the allowed
	number of characters.
NUMBER TOO LARGE	The operator entered a number that is beyond the limits
	of a particular Configuration Item.

4.7Host Communication Loopback Tests

Communications between a host computer and several field devices, such as the ATT, usually occurs on a single set of wires. Each device is individually addressable by the host computer.

The ATT contains special circuitry that reduces the chance of one ATT shorting the host communication lines. The circuitry allows the ATT to disconnect itself from the communication line and perform a loop-back test.

The test is performed automatically on power-up. It is also performed periodically if communication is no longer detected from the host computer.

If the ATT fails its local loop-back test, it will generate a 'Bad Comm Board' status and disconnect itself from the host communication lines. It will remain disconnected until it can pass its internal loop-back test.

30 Installation and Operations Manual