DTL-DB10-6 データシートの表示（PDF） - Murata Manufacturing

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DTL-DB10-6

Interface Board for Serial-Input Electronic Loads

Murata Manufacturing 

InterfaceBoard for Serial-Input Electronic Loads

DTL-IFB-485

RS485 Communication (Cont'd)

Initial Set Up

If you are using a RS232 - RS485 adapter on a standard COM

port, connect the transmit A (or -) terminal to line 4 of the flat

cable, transmit B (or +) to line 5, receive A (or -) to line 8,

receive B (or +) to line 7 and ground to line 6, 9 or 10. If you

wish to connect the 5v power through the cable, connect the

+5V to lines 1,2 & 3 and the common to lines 6, 9 & 10.

Each DTL-IFB-485 has two hexadecimal rotary dip switches

that set the unit address. Each interface board must be set to a

unique address, no two or more units on the same cable can

have the same address otherwise data collisions will occur on

the RS-485 receive bus. This will not cause any physical

damage but will result in garbled data. Select any address(es)

that is (are) convenient. Example: A123 is equal to 7B in Hex

so rotary switch SW2 is set to "7" and SW3 is set to "B".

Set the baud rate dipswitches to 9,600 baud (as described in

the previous section). If you wish to use a lower baud rate, then

make changes in the terminal software settings (below) to

match your selected speed.

Turn on the 5V power to the DTL-IFB-485’s and interface

adapter if used. To test things out, a standard dumb

terminal program such as Windows Hyperterminal (step-

through example starts on page 8 herein) can

conveniently be used.

Command Syntax

The command syntac of the DLT-IFB-485 is very specific

and must be adhered to for satisfactory operation. The

microcontroller on board the DTL-IFB-485 has limited

resources available for "command parsing", so its up to

the user to provide properly structured command strings.

All commands are case insensitive (i.e. A000_?R is the

same as a000_?r). All commands must be followed by a

carriage return (ASCII code 13) to execute.

1. A123_3456

Writes decimal data 3456 to load with address 123. Stores

data, but does not load the output register. Unit responds with

OK, FAULT or ERROR. OK if operation is successful, FAULT

if load is out of compliance (e.g. zero voltage applied) or

ERROR if error in data (non-numeric or > 4095). No response

if address is invalid (no module) or out of range >255. If

address only is sent i.e. Axxx, a unit with the selected address

will respond with OK (this is a way to find if units are correctly

connected to system and responding).

2. A123_3456L

Writes decimal data 3456 to load with address 123 and loads

DTL2A Series output register updating output current. Error

response as in #1.

3. A234_?S

Returns fault status from #234. Responds OK or FAULT.

FAULT condition corresponds to out of compliance or no

voltage at output terminals of the load.

4. A006_?V

Returns A/D input channel voltage in 5 digit decimal string,

range from 0.000 to 4.095/8.190/40.95V (depending on

selected range).

5. A017_?R

Returns range selected on A/D in single digit string. For

example, responds 4.095 CAL if range calibrated or 4.095

UNC if range is uncalibrated (may be +/-3% error). Range is

selected by dip switches on DTL-IFB-485 board (4.095V or

8.190V or 40.95V)

6. A123_?D

Returns the value of the last data sent to the DTL2A Series

load (e.g. 2037). Note that if you send A123_1234 without an

L at the end to load the data, the ?D command will return the

last data actually transferred to the load, not 1234.

The delimiter character (underscore character_) is

critical between address and data or command.

A1232345L (with no delimiter) will not execute and will

produce an Error response because the data is in the

wrong position in the string (it looks like 345L), whereas

A123--2345L (with 2 delimiters) will produce an Error

response as the parser is expecting a number in the 6th

character position. The delimiter character can be any

with the exception of carriage return (ASCII13) or

backspace (ASCII 11?). Convenient delimiter characters

that the parser ignores are typically underscore_, #, x

(any letter, number or symbol on the keyboard) or

Space. The parser has no capability of throwing away

leading spaces, zeros, etc.

Any command that includes an address i.e. is unit

specific, will generate a response, typically OK, FAULT

or ERROR but certain global commands such as C

(clear), L (load) or G_1234 (global data load) that affect

all DTL-IFB-485’s on the cable will not generate any

response although they will light the activity LED’s of all

units. The family of commands and responses is as

follows:

7. L

Simultaneously loads all modules with previously stored

data. There is no return response to this global command.

8. C

Simultaneously zeroes output of all modules. There is no

return response to this global command.

9. G_0000

Loads all units with same data, regardless of address.

There is no response to this command. Command will not

execute if data > 4095.

10. A123_CAL

Performs calibration (Test/setup purposes only). Select

desired range on dipswitches on DTL-IFB-485 board. Connect

a voltage calibrator to load outputs and using a dumb terminal

or terminal emulation program enter the command and follow

prompts. On completion, the range will be calibrated and the

calibration constants (zero & gain) will be permanently stored

in internal EEPROM. This command must

be performed for each range separately to calibrate all ranges.

All command strings must end with a Carriage Return (CR =

13 decimal) to activate the command.

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