SkyWave IDP-782 - Rs-485

IDP-782 - Hardware Guide
l Interrupting service for receive, transmit.
l Receive and transmit message queue management.
The terminal incorporates a controller area network interface with signaling rates up to
1 Mbps.
Note: You must provide a termination resistor externally to the terminal.
Parameter Min. Typical Max. Units
Input Common Mode Voltage -7 - 12 V
Differential Input Threshold -6 - 6 V
Peak to Peak Output Common Mode Voltage - 1 - V
Differential Output Voltage (dominant) 1.2 - 3 V
Differential Output Voltage (recessive) No Load -0.5 - 0.05 V
CANH or CANL -36 - 36 V
ESD Protection
Human Body Model
1
- ±15 - kV
Contact Discharge Model - ±8 - kV
3.5.2 RS-485
The terminal provides a half-duplex RS-485 /J1708 interface as an accessory bus and for SCADA
interfacing with signaling rates up to 250 kbps.
Note: You must provide a termination resistor externally to the terminal when required.
The electrical characteristics of the interface are:
Parameter Min. Typical Max. Units
Input Common Mode Voltage -8 - 13 V
Differential Input Threshold -200 -125 -50 mV
Output Common Mode Voltage - 1.5 3 V
Differential Drive Output, 54 Ω load 1.5 - - V
ESD Protection
Human Body Model - ±15 - kV
Contact Discharge Model - ±8 - kV
1
All electrical interfaces operate normally after being subjected to 8 kV ESD contact discharge per IEC 60945 and IEC 61000-4-2
human body model, level 3.
T213, Version 02
35
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