Instruction Manual

4-7

4-2 Multi-drop Link Mode Data Communication

Controlling Multi-drop Link Mode

1. A "polling request" is sent from the host computer.

2. The BL/SR/RF Series device responds with its read data.

• mm = 01 to 31: The BL/SR/RF Series device ID number

• nnnn = the number of characters in the data (4 ASCII characters)

* the total of character count for the data is part 1 + part 2.

• (Data) = Data read

ERROR : A read error has occurred.

e : Nothing has been read

OVER : A buffer overflow has occurred.

"Send Buffer Capacity" (Page 4-9)

NC : No BL/SR/RF Series device bears the specified ID number or the

communication has not been established with that device.

ERR** : Error code (**: Error code)

• The polling command formats are both possible.

At the end of the command, may be added. At the head of the command, may

be added to clear the N-410 receive buffer.

• Read data must be set to be formatted in one of the following ways ("header" and "delimiter"

settings).

"Selecting a protocol" (Page A-16)

Read data can be formatted in the following manners or in any other manner desired.

Header : , , None

Delimiter : , ,

(About settings)

Manual polling can be used if no ID number has been registered with the AutoID Navigator (once

ID numbers have been recorded, be sure to activate auto-polling mode).

"Auto-polling" does not send "manual polling" commands from the host computer, but rather

has the N-410 send the data received from BL/SR/RF Series devices to the host computer

as needed, thus reducing the load on the host computer.

% P mmHeader Delimiter

% P mm -Header Delimiter(Data)

ID addition

(1) (2)

nnnn

% P mm CR % P mmSTX ETX

ESC

STX

ETX

Reference