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The PACS

command consists of one to eight hexadecimal

bytes and dictates if any data will be returned in the

responding ADU. The responding ADU is shown below:

Address

Function

($41)

PACS

data

CRC or LRC

If the PACS

command does not have any returning data,

the CRC or LRC bytes will immediately follow the

Function Code, $41. Otherwise, the PACS

data will

either be 1 byte (SING byte commands), 2 bytes (DOUB

byte commands), or 4 bytes (QUAD byte commands).

Appendix "A" provides a summary of all PACS

commands. Refer to "The PACS

Standard" manual for

complete details.

The basic structure of the PACS

command is

shown below:

Command

1 byte

Address

2 bytes

Data

0, 1, 2, or 4 bytes

The Command is always one byte, referred to as the

PACS

Code (see Appendix "A"), and dictates how many

Data bytes, if any, are required.

When required, the Address is always a two byte value

with the most significant byte following the command byte.

Some commands do not require an address, such as Indexed

commands; therefore, the data bytes, if any, will follow the

command byte.

The number of Data bytes is dictated by the command byte.

For DOUB (2 bytes) and QUAD (4 bytes) byte values, the

most significant byte is sent first. Some commands, such as

the INCR (increment) command, do not require data. Other

commands, such as the READ command, do not require

data bytes in the PACS

command, but rather dictates how

many bytes are to be returned by the DHC controller. Data

is returned most significant byte first.

PACS

PARAMETERS

While any two byte address value is valid, only a

select few correspond to parameters of significant meaning

to the user - these are referred to as the PACS

Parameters.

PACS

parameters can either be Read Only Parameters or

Read/Write Parameters. The following sections describe

the PACS

parameters available in the DHC Series

controllers. Table 1 provides a summary of these

parameters.

Reading locations, or addresses, not assigned to a

PACS

parameter will return data of unknown values.

Changing locations that are not assigned as Read/Write

Parameters are prohibited by the DHC controller and will

not alter the contents of such locations. It should be noted

that the DHC controller's internal memory pointer, which is

used for Indexed commands, will be set according to the

PACS

command and the provided address; even if the

address is not assigned to a parameter.

Table 1 - DHC Series PACS

Parameters

ADDRESS SIZE READ ONLY PARAMETERS

00B0

DOUB Analog Command Input

00B2

DOUB Battery Voltage

00B4

DOUB Average Motor Current

00B6

DOUB Motor Current Trip Setting

00B8

DOUB Position

00BD

SING Alarm Flags 2

00BE

DOUB Average % Duty Cycle

00C0

DOUB Maximum Deviation

00C2

QUAD Hours of Operation

00C6

QUAD Cycles of Operation

00CA

SING Alarm Flags

00CB

SING Mode

00CC

SING Configuration

00CD

SING Override Control

606C

DOUB Serial No. MSB / Model Code

606E

DOUB Serial Number

DDRESS SIZE READ

WRITE PARAMETERS

00D0

DOUB Aux Closed Position

00D2

DOUB Aux Open Position

00D8

DOUB PACS

Command Input

00ED

SING PACS

Control Register

00EE

SING PACS

Timeout Setting

00EF

SING PACS

Reset

6070

DOUB

User Non-volatile Memory

6072

DOUB

6074

DOUB

6076

DOUB

6078

DOUB

607A

DOUB

607C

DOUB

607E

DOUB

Brand	Peaktronics
Model	DHC-100
Category	Controller
Language	English

Peaktronics DHC-100 User Manual

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