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22 DDC-100 Direct-to-Host Programming Guide FCD LMAIM4019-00 FCD LMAIM4019-00 DDC-100 Direct-to-Host Programming Guide 23

Second Command

Query B30600001A009978

Response B30600001A009978

Second Command Message Breakdown

Query Response

B3 Slave (Field Unit) Address B3

Slave (Field Unit)

Address

06 Function 06 Function

00 Register Address Hi 00 Register Address Hi

1A Force Data Hi 1A Preset Data Hi

Force Data Lo 00 Preset Data Lo

9978 Error Check (CRC) 9978 Error Check (CRC)

Note 1: 0000h equals Register Address 40001 (ﬁeld unit register 1, command register).

Note 2: 1A00h equals 6656.

Example of single register write “move-to” command

This command allows a Host to issue the “move-to” command with a single write utilizing the

Modbus function code 06. Register 1 will be used to complete this command.

Rules for utilizing this command:

• Field unit scaling must be congured for 0-100.

• To use the hexadecimal method of determining a single write “move-to” command, 0x4B is

always placed into the Hi Byte of Register 1.

• The desired position value is always placed into the Lo Byte of Register 1.

To move the actuator to a position of 50%, place the value 0x4B in the high byte and the value of

0x32 (50 decimal) into the low byte.

Example:

Hex format: 0x4B32

To use the decimal method of determining a single write “move-to” command, add the desired

position value to 19200.

Example:

Desired position: 50%

19200 + 50 = 19250

Example of single write “move-to” command

Move an actuator at address 1 to 50% of open by writing the value of 19250 (0x4B32) to the ﬁeld

unit 40001 register. The actuator will then move to a position of 50% open.

Example

Query: 010600004B323EEF

Response: 010600004B323EEF

Message Breakdown

Query Response

01 Slave Address 01 Slave Address

06 Function 06 Function

00 Starting Address Hi 00 Starting Address Hi

00 Starting Address Lo 00 Starting Address Lo

4B Preset Data Hi 4B Preset Data Hi

32 Preset Data Lo 32 Preset Data Lo

3EEF Error Check (LRC or CRC) 3EEF Error Check (LRC or CRC)

3.2.7 Modbus Function Code 08 (Diagnostics)

This function code provides a series of tests for checking the communication system between

the Host and ﬁeld units (slaves), or for checking various error conditions within the ﬁeld unit.

This function code uses a two-byte subfunction code ﬁeld in the query to deﬁne the type of test

to be performed. The ﬁeld unit echoes both the function code and subfunction code in a normal

response. It does not affect the ﬁeld unit in any way. If this exchange is successful, then the

communication is successful.

A listing of the supported diagnostic two-byte subfunction codes is given in Table 3.8.

Example

Request a loopback (return query data) from the ﬁeld unit at network address 3.

Query 030800000000E1E9

Response 030800000000E1E9

Message Breakdown

Query Response

03 Slave (Field Unit) Address 03 Slave (Field Unit) Address

08 Function 08 Function

00 Subfunction Hi 00 Subfunction Hi

00 Subfunction Lo 00 Subfunction Lo

00 Data Hi 00 Data Hi

00 Data Lo 00 Data Lo

E1E9 Error Check (CRC) E1E9 Error Check (CRC)

Table 3.8 – Diagnostic Codes Supported by the DDC-100 Field Unit

Code Name

00 Return Query Data

01 Restart Communication Option

02 Return Diagnostic Register1

03 Change ASCII Input Delimiter

04 Force Listen-Only Mode

10 (0A Hex) Clear Counters and Diagnostics Register

11 (0B Hex) Return Bus Message Count

12 (0C Hex) Return Bus Communication Error Count

13 (0D Hex) Return Bus Exception Error Count

14 (0E Hex) Return Slave Message Count

Note 1: Contains DDC-100 Field Unit diagnostic information. For engineering use only.

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 32 33

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