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Wiring a 25 Pin CNC RS232 to 25 Pin PC Host
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Null Modem Cable with RTS/CTS hardware handshake
| RS232 Serial Port
Cable |
| MALE cable plug mates with CNC DB25 Pin Male Connector |
|
FEMALE cable plug mates with PC DB9 pin Female Connector |
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| DB25p pin |
signal |
DB25s pin |
signal |
| 2 |
TX |
|
--» |
|
3 |
RX |
| 3 |
RX |
|
«-- |
|
2 |
TX |
| 7 |
GND |
|
--- |
|
7 |
GND |
| 4 |
RTS |
|
--» |
|
5 |
DTR |
| 5 |
CTS |
|
«-- |
|
4 |
RTS |
| 6 |
DSR |
jumpered |
|
jumpered |
6 |
DSR |
| 8 |
DCD |
8 |
CTS |
| 20 |
DTR |
20 |
DTR |
Notes:
- 5 RS232 wires are needed in the cable - recommend 24AWG shielded cable.
- The jumpered pins 6,8,20 are shorted together inside their respective connector shells.
- Set CNC and PC to use XON/XOFF protocol OR Hardware handshaking.
- Shield of cable should be connected to earth ground or chassis ground at one end. (or left open).
According to RS232 standards:
- At 9600 baud cable length should not exceed 100 feet.
- Cutting baud rate in half allows cable length to be doubled.
- Lower capacitance cable allows longer runs - shielding increases capacitance.
1813 East Dyer Road, Suite 412, Santa Ana CA 92705
(714)505-4004, (949) 252-1055 FAX (949)252-1490
www.adrco.com
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