Thanks for the replies. Mouser has a EEPROM that has around 100 year data store. I'm going to use those for replacements for the Dallas Memory Module's.
It's actually for a two way radio. I'm a ham, and I have several radio's that were manufactured in the 1980's. There programmable by computer to input the frequency information into the radio. The data is held by a Dallas Memory module and I read a write up online that states that they last...
I'm looking to replace a Dallas Memory Module in a CPU circuit with a parallel EEPROM 28C16 IC. I pulled up several spec sheets for a 28C16 and it says that its data retention is 10 years. What exactly does this mean? Does this mean that the data will only be stored for 10 years? The Dallas...
UPDATE: I have one of the 2 channel units that do not rely on the clock signal and data signal.. I'm going to hook one of those up and see if it works on that unit.
I do have an older tektronix oscilloscope. It's not one of the newer, nicer digital displays that has all the measurement features. I'll try to get that hooked up and get some images and data on what exactly I'm looking at.
That's about all I could find for the information. I'm trying to understand a little bit more on the possible scenario you gave me. Using my RS-232 DB 25 communication output, convert that to RS-485 and transmit those signals over CAT-5 twisted pair cable, then on the receive end convert the...
Since I have the multi channel radio, it looks like I'm trying to correct the communication in pins 12 and 13. All the other functions seem to work right. I can key the transmitter and see the tx light and receive light come on but the display and channel select isn't functioning.
Serial Communicaton
I've attached JPEG images on what all the connections are. I've also included the link from where I got my images in case I missed something.
http://www.repeater-builder.com/motorola/maxtrac/maxtrac-logic-board-jumpers.html
It is a Motorola Radius 16 ch 40 watt radio. It covers the 70cm ham band. I do have a pin out that shows what each pin is used for. Does twisted pair cable actually perform better in terms of capacitance buildup throughout longer distances?
Thank you for the replies. Berkeman, I'm using this cable to remotely control the two way radio remotely. If you remove the faceplate, there is 25 pin total connector that runs to the actual transmitter unit. I'm not sure what each conductor does, but every one of them is wired between the...
I have a two way radio that I'm trying to control remotely through 120 ft of 25 conductor cable at 22 gauge. The radio uses serial communication between the actual transmitter and control head unit. After I wired the pin's up accordingly, there is to much noise pickup through the cable and it...