Money Controls SR5 - cctalk Interface Circuits; Circuit 1: cctalk Standard Interface

SR5 Technical Manual TSP010.doc Issue 3.0 - October 2001
CONFIDENTIAL
Not to be disclosed without prior written permission from Money Controls
Page 37 of 50
20) cctalk Interface Circuits
♦ Circuit 1 – cctalk Standard Interface
Figure 17: Circuit 1, cctalk Standard Interface
This circuit uses an open-collector transistor to drive the data line and a diode
protected straight-through receiver.
Typical Components
Diode BAT54 Schottky Diode, low forward voltage drop
NPN BC846B High gain, medium signal, NPN transistor
PNP BCW68 High gain, medium signal, PNP transistor
100K
Com
Data
0V
Rx
TX
+5V
NPN
PNP
2-wire Serial Bus
10K
68K
68K
100K
100K