Other Parts Discussed in Thread: SN65LVDS179
3 DS8921ATM chips are being used to sequence three systems together. So, this isn't a high speed or high data rate application.
The driver on the master chip drives ("pulse" every 2 milliseconds) the receiver on itself, the receiver on slave 1, and the receiver on slave 2.
Unshielded cable is approximately 200 feet (Down a tower and back up the tower). Resistance roughly 5 ohms.
The driver's on the slave chips are left open at the end of the cable (~100 feet, down tower). Would it be a good idea to terminate the end or leave open? (we see some noise when the differential lines are left open) If we need to terminate the differential lines together what ohm resister do you recommend?
What length of cable is considered a transmission line?
If this is a transmission line case where matching/termination resisters are needed, can we add resisters in parallel approximately half way into the "transmission" line?
Part: DS8921ATM/NOPB