5

Overview

The DIP Switches and the Default Serial Terminal set the DLCD serial

communication operating mode to either DH-485 mode or MODBUS mode.

DH-485 mode allows the DLCD to be connected to a DH-485 network.

MODBUS mode allows programming of the DLCD using RLCPro.

DH-485 Mode

Integer File

Each DLCD is assigned a unique Integer File in the PLC that the DLCD uses

to transfer data. Switch A (SWA) sets the target Integer file in the range

N7..N70.

Note N8 and N9 are invalid Integer File numbers and therefore cannot be used.

Table 16 - Integer File settings using DIP Switch A

DLCD Address

Each device on a DH-485 network must have a unique address. Switch B

(SWB) allows the DLCD address to be set in the range 0..31.

Table 17 - Selections for DLCD Address using DIP Switch B

PLC Address

The DLCD transfers data with a target PLC. Switch B (SWB) allows the

address of the target PLC on the DH-485 network to be set in the range 0..7.

Table 18 - Selections for PLC Address using DIP Switch B

Example 1

This example shows the DIP Switch settings for a DLCD operating in DH-

485 mode with the following configuration.

PLC Address

: 1

DLCD Address

: 8

Integer File

: 10 (N10)

Communication Settings

The DLCD has a fixed baud rate of 19200 when used in DH-485 mode.

2.0 Setting the DIP Switches

INTEGER

FILE

SWITCH POSITION

COMMENT

1

2

3

4

5

6

N7

DN

DN

DN

DN

DN

DN

Valid File Number

N8

DN

DN

DN

DN

DN

UP

Invalid File Number

N9

DN

DN

DN

DN

UP

DN

Invalid File Number

N10

DN

DN

DN

DN

UP

UP

Valid File Number

N11

DN

DN

DN

UP

DN

DN

Valid File Number

..

Valid File Number

N70

UP

UP

UP

UP

UP

UP

Valid File Number

DLCD

Address

Switch Position

1

2

3

4

5

0

DN

DN

DN

DN

DN

1

DN

DN

DN

DN

UP

2

DN

DN

DN

UP

DN

3

DN

DN

DN

UP

UP

..

31

UP

UP

UP

UP

UP

PLC

ADDRESS

SWITCH POSITION

6

7

8

0

DN

DN

DN

1

DN

DN

UP

2

DN

UP

DN

..

7

UP

UP

UP

1

2

3

4

5

6

1

2

3

4

5

6

7

8

UP UP

UP

UP

DN DN DN DN

DN

DN DN DN DN DN

MODBUS Mode

In MODBUS mode, the DLCD responds to MODBUS RTU frames and

therefore allows programming using RLCPro (refer to DLC Bulletin for

detailed information on using RLCPro with the DLCD). To configure the

DLCD for MODBUS without changing the DIP switches, use the Default Serial

Setting Terminal.

DN

DN

DN

DN

DN

DN

DN

DN

DN

DN

DN

DN

DN

DN

8

7

6

5

4

3

2

1

6

5

4

3

2

1

none

8

Parity:

Data Bits:

9600

Baud Rate:

247

Address:

RTU

Protocol:

Serial Communication Defaults:

DEFAULT SERIAL SETTING CONNECTIONS

If using software selectable serial

settings and the serial settings are unknown

or forgotten, they can be temporarily reset

to the defaults by connecting the “Default

Serial Setting” terminal 7 to “Output

Common” terminal 4 with a jumper.

Alternatively, set all DIP switches Down as shown in Example 2. The DLCD

leaves the factory in this state, and is therefore ready to be programmed using

RLCPro.

Example 2

This example shows the DIP Switch settings for a DLCD operating in

MODBUS mode with the default serial settings.