
Installation
Interface Connection
NCR 5635 Spray Currency Dispenser Service Manual
2-9
NCR - CONFIDENTIAL AND PROPRIETARY
Use pursuant to Company Instructions
Pins 2, 3, 4, 5 and 7 should be connected to their namesakes on a
DCE (data communication equipment) interface. If the RTS and CTS
handshake option is not required, pins 4 and 5 must be connected
together.
The polled interface may be selected by linking pin 22 to pin 10. In
this case the transmitter must be enabled by linking CTS to RTS
(pins 4 and 5) and a communications identity address must be
selected using pins 12, 24 and 25.:
Electrical
Characteristics of
Interfaces
2
The signal ground connection on pin 7 is connected to the dispenser
ground via a 100 ohm series resistor. If this causes unacceptable
voltage loss, pin 10 may be used instead. This provides a direct
connection to the dispenser ground but may reduce noise
immunity.
The logic level interfaces are designed to use the standard TTL
voltage thresholds (High, greater than 2V; Low, less than 0.8V).
Pin 4
RTS
Request to send, FROM the dispenser.
This circuit will become active (ON, +10V)
when the dispenser is waiting to transmit.
Pin 5
CTS
Clear to send, TO the dispenser. This
circuit is made active by the host
controller in response to an ON state on
RTS. The dispenser will only transmit
after the CTS is active. Deactivating CTS in
the middle of a message will temporarily
halt the transmission until both RTS and
CTS become active again.
Pin 7
GRD
Communications ground
Identity
Pin 12 (ID0)
Pin 25 (ID1)
0 (30H0
1 (31H)
Pin 24
2 (32H)
Pin 24
3 (33H)
Pin 24
Pin 24
master.bk Page 9 Wednesday, March 27, 2002 9:35 AM