RS-232 Wiring
Following is the typical wiring configuration for CNCs. Call CCI if you have any questions.
Using DB25 connectors both ends | ||
|---|---|---|
This wiring assumes the following: | ||
| PC (25 Pin socket) | CNC (25 Pin-as required) | |
| 2 | 3 RXD | |
| 3 | 2 TXD | |
| 4 | 5 CTS | |
| 5 | 4 RTS | |
| 7 | 7 GND | |
| 6 | Jumper pin 6 to pin 8 to pin 20. | |
| 8 | ||
| 20 | ||
| Note! In general jumpering pins 6 to 20 together will suffice. For Fanuc CNC's jumpering all 3 pins is required. | ||
Using DB9 connector at the P.C. and DB25 at the CNC | ||
|---|---|---|
| This wiring assumes the following: At the PC pins 3 and 7 are outputs. Pin 5 is logic ground. Pins 2 and 8 are inputs. At the CNC pins 2 and 4 are outputs. Pin 7 is logic ground. Pins 3 and 5 are inputs. | ||
| PC (25 Pin socket) | CNC (25 Pin-as required) | |
| 3 | 3 RXD | |
| 2 | 2 TXD | |
| 7 | 5 CTS | |
| 8 | 4 RTS | |
| 5 | 7 GND | |
| 6 | Jumper pin 6 to pin 8 to pin 20. | |
| 8 | ||
| 20 | ||
| Note! In general jumpering pins 6 to 20 together will suffice. For Fanuc CNC's jumpering all 3 pins is required. | ||
Notes!
Connect the shield on the P.C. side to the chassis of the PC or
RocketPort
adapter. This is easily done if you use a metal or metallized plastic connector
cover (hood) and make sure that the drain wire (that's an extra wire in a foil shielded
cable that is connected to the foil) or the braid of a braided type shielded cable makes
contact with the connector cover.
Typical parameter settings on the DNC side are as follows:
Protocol: Generic RS-232
Data rate: 9600 baud (CNC dependent )
Data type: ASCII
Parity: Even
Stop bits: One
Handshaking: If Fanuc or Yasnac like CNC's, use
"Both no wait". the RTS signal from the CNC goes on at the beginning of any data
transfer, and off at the completion. If not, you must choose the handshaking method
depending upon the CNC. For example, "XON/XOFF wait" is normally used with
controllers that emulate EIA RS-491 level II, whereas RTS/CTS is used with level 1.
