Command Format; Step-By-Step Examples (Only For Single Hpb Connection) - Honeywell HPB User Manual

HPB/HPA User Manual

2.5 COMMAND FORMAT

Any command interaction with the HPB requires electrical connection to the RS-232 or RS-485 serial
communications pins. There are two basic types of commands: action directing commands and information
requesting commands. Theses commands are described in Section 5.
Typical HPB commands have the form
Where:

2.6 STEP-BY-STEP EXAMPLES (Only for single HPB connection)

The following examples assume that the reader has followed them in order.
•
READ SINGLE PRESSURE
Once the HPB is powered up and connected to a computer, enter the following command:
Type:
where
Note: The ―?‖ indicates a response from a null address HPB – one which has not been assigned a
device ID. A null address, 00, is coded into each HPB at the factory. When an RS-232 null address HPB
responds, it adds one to its address, hence, the response ‗01'. Refer to the ID command in Appendix A
for a description of addresses and responses.
In the reply, the ―01‖ identifies the individual unit address (range 01-89). The ―CP=15.458‖ indicates a
compensated pressure of 15.458 psi. Your unit may not show this specific reading, depending on the
applied pressure it is measuring.
8
*ddcc = nnn <cr>
* is the command header character
dd is the decimal address of the HPB
is a command (refer to Commands – Section 5 for a complete
cc
description
=
of commands)
nnn
equal sign (required in some commands)
<cr>
additional characters (required in some commands)
carriage return is required to end all commands
(do not type, press the ENTER/RETURN key)
*00P1 <cr> Response:
* indicates the start of a command
00 is the null address of the HPB (see note below)
P1 is the command to read the most current pressure
?01CP=15.458
(for RS-232)
?00CP=15.458 (for RS-485)
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