ASCII code with Micrologix 1500

[crsgab 0]

Hi: I want to connect a ML 1500 wih a multimeter , I wanna automate some resistance measurements. My multimeter has a RS 232 port and I'm connecting it to channel 1 on PLC. I can comunicate with the PLC but it send me codes I don't understand, every time I send the AWA instruction I get characters from multimeter like this( at this point my multimeter is registering 19.2 ohms): \B9\AE\B5\A0\CF\E8\ED\8D\CF\C8 I connected my multimeter to my pc and it works with 600 baud rate with 7 bits of data size if I change data size to 8 I got weird characters. I wonder if the PLC can interpret the characters that multimeter sends. On channel configuration I only can adjust baud rate but not the bit size. Any suggestions? Best regards Gabriel

[Charlie Maher 0]

It looks like your getting HEX values from your example string of data. Does your meter manual have a sentence reading "Monitor, display and store data using the optional PC software"? I did a search and that is what Extech's meter describes. What meter are you using? Is there any software for it?

[crsgab 0]

I'm using an Steren Multimeter it has a sofware but doesn't have the option you mentioned. I think the problem is on the bit size , I connected the PLC to a Harris resistance kelvin meter with serial port and has give me better results than multimeter. Best regards

[Leadcommander 0]

Can you configure your multimeter to a different bit option using the software that came with the meter. What characters did you send in the AWA command?

[rpraveenkum 5]

crsgab have you tried with hyperterminal whatever value comes same will be reflected in plc

[crsgab 0]

At first I connected the multimeter using hyperterminal but the multimeter needs whatever character to send a reading, so on the hyperterminal was not possible. I downloaded the hercules aplication where I can configure baud rate , bit size, parity and also send characters to serial port an only on that way I got a reading on computer. The software for the multimeter does not have an option to configure the port. Anyway I'm using another meter and is working as I wanted. Thanks for your help. Gabriel