Worth Data 520-RF Operations Instructions download pdf (Page 28)

Please refer to Host Response Delay to determine if you need to compensate

for slow host program response by slowing down the retry time when failing

to get a response from the base station.

Host Response Delay

(This parameter only applies to serial 2-way Base Stations - B58/B59 with Host

controlled acknowledge enabled.)

If you have a serial 2-way Base Station with Host controlled acknowledge

enabled under Protocol, and your host computer program is slower in

responding than 1/2 second, in order to reduce retry radio traffic, you need to

specify a new delay time. This parameter needs to be set for each 2-way laser

scanner used. Specify in 1/10 seconds of 01 (.1 secs) to 99 (9.9 secs).

Suppose you are running a Unix application that takes 1 second from receipt

of data to respond: specifying 10 will add one second to the retry delay,

thereby increasing the listening time before retrying. This is particularly

important when operating multiple scanners on one base station, but it is also

helpful with only one scanner. Even with one scanner, the acknowledgement

can collide with a retry without sufficient delay.

With normal Windows and DOS applications, the host response is so fast, it is

not necessary to change this parameter. However, if you have a very

complicated program that must access multiple databases for each data item

transmitted, you may need to specify additional delay.

Test the Reader with your computer

If you are connected by keyboard interface, or if you have a serial reader and

are using PortKey with an IBM compatible, you should be able to scan the bar

code on the next page, hear a beep (2 beeps on 2-way laser), and see data

displayed on the computer's screen. First get your computer to some program

where you can type and see it on the screen, (i.e. Notepad). Now scan the

TEST LABEL on the following page. Your screen should show:

TEST LABEL

If you can't read the TEST LABEL, see the Scanning Techniques back on page

10. If you don't get a beep, try moving closer to the Base Station and moving

the scanner closer or farther away from the bar code. If you get a beep (two

beeps with 2-way laser scanner), but no data displayed:

1. Be sure your Computer Interface is set correctly,

2. Try the Learned Timing computer interface settings as detailed in the

Installation and Setup section of this manual.

If you still have trouble, see the Troubleshooting section of this manual.

If you are connected to serial port and aren't using PortKey, you will need to

use a communications program; or use the WDR Serial Test Program

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Worth Data 520-RF Operations Instructions Page 28