Money Controls SR5 - Circuit 3: cctalk Direct Interface

SR5 Technical Manual TSP010.doc Issue 3.0 - October 2001
CONFIDENTIAL
Not to be disclosed without prior written permission from Money Controls
Page 39 of 50
♦ Circuit 3 – cctalk Direct Interface
Figure 19: Circuit 3, cctalk Direct Interface
A very low cost solution is to interface a single pin on a microcontroller directly
onto the cctalk data line. The pin can be switched between active-low for
transmitting and high-impedance tri-state for receiving.
2-wire Serial Bus
Data Com
+5V
Network Load at Host Controller
47R
10K
0V
Bi-directional drive
Voltage clamp