Denso AT10Q-SM User Manual download pdf (Page 55)

Chapter 9 Communication

9.1 RS-232C Interface

With the RS-232C interface being selected, the scanner uses asynchronous data transmission and communicates with

the host computer or external equipment via the RS-232C. You can set various communications conditions using the

QR-coded parameter menu or configuration software (ScannerSetting_2D). Code data read is transferred in the

following format.

(1) Communications protocol

You can select either non-acknowledge mode or ACK/NAK mode.

Non-acknowledge mode (default)

If the CTS signal is at a high level (Enable transmission), the scanner transmits code data read.

Note: The configuration software (ScannerSetting_2D) provides CTS timeout settings from 100 ms to 9.9 s in 100-ms

increments and two CTS signal control choices Yes and No.

ACK/NAK mode

If the CTS signal is at high level (Enable transmission), the scanner transmits code data read. After that, the scanner

waits for and then processes a response. If the response is an ACK, the scanner normally ends the transmission; if it is

a NAK, the scanner transmits the code data again.

Note: The configuration software (ScannerSetting_2D) provides CTS timeout and ACK/NAK response settings each

from 100 ms to 9.9 s in 100-ms increments.

(2) RTS signal control protocol

You can select either the scanner ready mode or the data ready mode.

Scanner ready mode (default)

The RTS signal goes High and stays at a high level when the scanner is ready to communicate at power on. Make sure

that the RTS signal is at a high level when transmitting a command from the host to the scanner.

Data ready mode

The RTS signal goes High before the scanner transmits data to the host and goes Low after the data transmission is

completed.

Commands can be transmitted from the host to the scanner regardless of the level of the RTS signal. However, there is

a short time when commands cannot be transmitted to the scanner after power has been turned on.

(3) Transmission speed

There are six transmission speeds available, ranging from 4800 bps to 115200 bps (default: 38400 bps).

(4) Characters

Characters that the scanner transfers are all ASCII codes. The frame format has the following parameters.

Data bits: 7 bits or 8 bits (default)

Parity: Odd, Even, or None (default)

Stop bits: 1 bit (default) or 2 bits

Note: When data contains binary data or 2-byte codes, selecting "7 bits" for the data bits transfers the 2-byte codes

with the most significant bits trimmed.

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Denso AT10Q-SM User Manual Page 55