Is there a limit to the RS-232 serial cable length?
• There is no fixed limit to the RS-232 serial cable length, but shorter is better. The SAVR and SAVR2 use a limited charge pump driver (don’t worry if you don’t know what that means) for the RS-232 interface, and as a result there is a reduced capacity for long serial cables. The technical spec states that lengths up to 50 feet should be possible, but in practical terms it is recommended that the RS-232 cable length be kept to 15 feet (4 meters) or less. For the electrically inclined, this limit is based on voltage drop and line capacitance, not interference. That means larger conductors will help, tight pair twist will help, but better shielding generally won’t. Will any RS-232 serial cable work with the SAVR and SAVR2? • Surprisingly no. We recommend you use the cable provided with the SAVR or SAVR2. If you choose to purchase a longer cable make sure it is a high quality cable. The SAVR and SAVR2 require the ground pins to be properly connected or they may not function reliably. Som
