SkyWave IDP-680 - Serial Interfaces; Rs-232; Rs-485;J1708; RF Specifications

IDP 600 Terminal Series - Hardware Guide
© SkyWave Proprietary 17 T200, Version 02
3.4 Serial Interfaces
3.4.1 RS-232
The RS-232 interface defaults to the following settings: 9600 bit/s, 1 start, 8 data, 1 stop
bit, no parity. The baud rate is configurable up to 230,400 bit/s.
The electrical characteristics of the interface are:
Parameter
Minimum
Typical
Maximum
Units
Serial Rx Input Low Threshold
0.6
-
-
V
Serial Rx Input High Threshold
-
-
2.4
V
Serial Tx Low Output
(3 K load)
-
-
3.7
V
Serial Tx High Output
(3 K load)
3.7
-
-
V
3.4.2 RS-485/J1708
The terminal can be configured for an RS-485 or J1708 interface. It can be used for
general bus or for SCADA interfacing. The RS-485/J1708 does not incorporate a
termination resistor.
The electrical characteristics of the interface are:
Parameter
Minimum
Typical
Maximum
Units
Input Common Mode Voltage
-7.0
-
+12
V
Differential Input Threshold
-200
-125
-50
mV
Output Common Mode Voltage
-
1.5
3.0
V
Differential Drive Output, 54 Ω load
1.5
-
-
V
3.5 RF Specifications
3.5.1 Frequency
Parameter
Value
Receive
Frequency Band
1525 to 1559 MHz
Modulation
OQPSK
Symbol Rate
3000 symbols/seconds
Polarization
RHCP
Transmit
Frequency Band
1626.5 to 1660.5 MHz
Modulation
OQPSK
Symbol Rate
900 symbols/seconds (maximum)
Polarization
RHCP