Using Arduino with RS232 Shield to access a terminal

Using Arduino Networking, Protocols, and Devices
1

Hi,

I have a terminal that a PC can receive and send data with the cable in the diagram attached. now I'd like to replace the PC with an Arduino with a RS232 shield as specified in the other diagram, so far I can send a few bytes over from arudino, but seems not getting any response, looks like the cabling issue, can anybody give me a guidance on cable pin layout that will work in this situation? Thanks,

V.C.

terminal_to_pc.jpg

RS232_Shield.jpg
RS232_Shield.jpg726×460 53.3 KB

2

I have a terminal that a PC can receive and send data with the cable in the diagram attached.

Links are better than pictures any day of the week.

so far I can send a few bytes over from arudino, but seems not getting any response

How do you know that you can send data, if you are not getting any response?

Using what code?

3

the link to the rs232 shield is:http://www.wvshare.com/product/RS232-Board.htm
I know data got sent to the device from Arduino from the response of the terminal, it printed something every time i sent:
Serial.begin(38400);

byte job[] = {0x04, 0x61,0x61, 0x05};
for (int i = 0; i < 4; i ++) {
Serial.write(job*);*

  • }*
  • // expecting two bytes from the terminal after sending the job above, but nothing come out *
  • int cnt = 0;*
  • while (cnt == 0) {*
  • n = Serial.read();*
  • if (n != -1)*
  • cnt ++; *
  • }*
4

the code is:

Serial.write(job [ i ]);

not:

Serial.write(job); i think formatting removes the brackets

5

i think formatting removes the brackets

Not if you post code using the # button up there, like you should.

the link to the rs232 shield is (not formatted correctly - see those buttons up top? Learn what they do)

Don't care yet) about the shield. I asked about the device you expect to be replying.

6

Hi Paul,

there is no link to that device, it's a dump terminal, in PC we use ACK/NAK to communicate.