ORBCOMM ST 9100 - Rs-485;J1708; RS-232 (Console and Auxiliary)

ST 9100 - HARDWARE GUIDE
Parameter Min. Typical Max. Units
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
- ±16 - kV
Contact Discharge Model - ±30 - kV
2.5.2 RS-485/J1708
The transceiver provides a half-duplex RS-485 or 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 transceiver when required.
The electrical characteristics of the interface are:
Parameter Min. Typical Max. Units
Input Common Mode Voltage -8 - 12.5 V
Differential Input Threshold -200 - 200 mV
Output Common Mode Voltage - 1.8 3 V
Differential Drive Output, 54 Ω load 1.5 2.3 - V
ESD Protection
Human Body Model - ±16 - kV
Contact Discharge Model - ±30 - kV
2.5.3 RS-232 (Console and Auxiliary)
The two RS-232 interfaces default to the following settings: 9600 bit/s, 1 start, 8 data, 1 stop bit, and no parity. The
baud rate is configurable up to 115,200 bps.
The electrical characteristics of the interface are:
Parameter Min. Typical Max. Units
Rx Input Low Threshold for DTE Connected - - -2.7 V
Rx Input High Threshold for DTE Connected 2.7 - - V
Rx Threshold for DTE Disconnected -0.3 - 0.3 V
Serial Rx Input Low Threshold 0.6 - - V
Serial Rx Input High Threshold - - 2.4 V
Rx Input Voltage Range -25 - 25 V
Serial Tx Low Output (3 kΩ load) - - -3.7 V
Serial Tx High Output (3 kΩ load) 3.7 - - V
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.
T413, Version 0.04 BETA © ORBCOMM
®
Proprietary
26