Chapter 6 - Remote Options
Remote Input Operation
Validation
Each character is validated for parity, framing, overrun, and break interrupt errors. If an
error is detected, an error message is displayed to indicate the type of error. For overrun
errors, an error record is transmitted back to the remote. For parity and framing errors, no
error record is transmitted since any transmission most likely will result in a similar error at
the remote and the record would be unintelligible. If a spurious character is received, an
error message is flashed on the LCD. When a complete input record is received, the
record is validated and processed. If the record is invalid, an error record is transmitted
back to the remote device. All input records are validated in the following manner:
• must begin with a “:,” and end with a carriage return, line feed sequence,
• must contain all valid ASCII characters,
• must contain a valid record type,
• must contain a valid function code, and
• must contain a valid function subcode when required.
Acknowledgment
The GSI 61 will acknowledge the correct reception and processing of all input records by
transmitting an ASCII ACK character after the record has been processed. This record
acknowledgment will not be sent if the GSI16 compatible record format has been selected.
Input Record Type
These records are sent by the remote device to control its functions.
Input Record Type 1 to 4
Reserved for the GSI10.
Input Record Type 5 - Pushbutton Code Record
This record type provides the ability to remotely simulate the operation of all user
controls. The record specifies the control operation using a function code which defines
the group of controls and a sub-function code which defines the specific parameter to
select of the function to perform. Control operations are processed in the same manner as
if they had been manually entered. All parameter or functional defaults and restrictions
will still apply.
6-7
1761-0100 Rev. B
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