User's Manual

15
April ’00 Chapter 2. Hardware
2.2.1.4 D - Carrier Phase Synchronization Interface
The carrier phase synchronization interface is used to establish hard wired carrier
phase synchronization with other readers through a single pair of wires. Its pin as-
signment is given in Table 9 and its specifications are given in Table 10.
Receiver Input 12 k
Ω
Receiver Sensitivity ±200 mV
Receiver Hysteresis 60 mV
Table 9: Carrier Phase Synchronization Interface
Pin Signal Description Direction
1 Sync Rx+ RS422/RS485 non-inverted synchronization data Input
2 Sync Rx- RS422/RS485 inverted synchronization data Input
3 GND Signal ground -
4 Sync Tx+ RS422/RS485 non-inverted synchronization data Output
5 Sync Tx- RS422/RS485 inverted synchronization data Output
6 GND Signal ground -
Table 10: CPS Interface - Specifications
Parameter Specification
Mode of Operation Differential
Number of Drivers On Line 32
Number of Receivers On Line 32
Maximum Cable Length 1200 m
Maximum Data Rate 10 Mbits/s
Maximum Common Mode Voltage +12 V / -7 V
Driver Voltage
High > +1.5 V
Low < -1.5 V
Driver Load 60 mA
Driver Output Short Circuit Limit
150mA to GND
250mA to VCC
Receiver Input 12 k
Ω
Receiver Sensitivity ±200 mV
Receiver Hysteresis 60 mV
Table 8: Synchronization Interface - Specifications
Parameter Specification