Model 2000W1000D
Rev B
19
2.6.6
Remote Commands
•
If a command or query is unrecognized it is echoed back out the port it came in on.
•
All commands and queries are terminated with a Line Feed character.
•
A Line Feed character is indicated by <LF> in subsequent command and query definitions.
•
All queries can be sent when the Keylock switch is in the INHIBIT, LOCAL, or REMOTE position.
•
All commands can only be sent when the Keylock switch is in the REMOTE position.
•
All spaces in command and query definitions are indicated by <space>.
•
If a query is recognized, its associated response is echoed out the port it came in on.
A
COMMUNICATIONS_ERROR
<LF> can occur if the time between commands or queries is too short,
or the internal RS-485 link between the IO Board assembly and the Multipurpose Board (MPB) assembly is
broken.
The development of application programs requires an understanding of the operation of the amplifier as well
as the intended application.
An application program on the computer/controller should issue only one character string (command or
query) at a time. After each functional command is issued, the amplifier’s status should be checked to ensure
that the command has been properly executed. The application program should allow sufficient time for the
function to be completed before checking the status.
The application program should facilitate the checking of the status just prior to issuing a command, since the
status could have been changed by a fault condition or by operator actions.
Variables represented by wild card characters i.e. x, y, z etc. do not indicate or delimit the number of
characters actually specified.
Table 2-4. Relationship between DCP Controls and Remote Communication
AC Power and
Circuit Breaker
Power
Keylock Switch
Remote
Communication
On
Off
On
Off
INHIBIT LOCAL REMOTE Command
Query
√
X
X
√
√
√
√
√
√
√
√
√
√
√
√
√
X
√
√
√
√
X
√
√
√
√
X
√
√
√
√
X
√
X = No, √ = Yes
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