FALCOM A2D-JP Description page 32

Description
Symbol
VOL (min) Minimum low-level output voltage
VOL (max) Maximum low-level output voltage
tr, tf Input rise and fall time
C out Maximum output load capacitance
(*) PWRIN refers to a + 3,3 V DC power input (PWRIN-3)
Table 17: Digital signal requirements
A2D–JP
Parameter
Pins 49 and 50: host port serial data input and output (SDO1
and SDI1)
The host port consists of a full-duplex asynchronous serial data in-
terface. Both binary and NMEA initialization and configuration data
messages are transmitted and received across this port.
The default ROM settings for the host serial data port are binary
message format, 9600 baud, no parity, 8 data bits, and 1 stop bit.
The default may be modified using custom OEM software.
The serial port settings may also be changed to a new configuration
using binary serial message 1330. The new serial port settings are
stored in SRAM and serial EEPROM. The next time the GPS recei-
ver is powered on or a master reset is initiated, the serial port confi-
guration parameters are accessed in the following priority:
1. If SRAM checksums are valid, the communication parameters
and initialization data parameters will be read from SRAM.
2. If SRAM checksums are invalid and EEPROM checksums are
valid, the communication parameters and initialization data
parameters will be read from EEPROM.
3. If SRAM checksums are invalid and EEPROM checksums are
invalid, the default values in ROM will be used.
The OEM application must provide any Line Driver/Line Receiver
(LD/LR) circuitry to extend the range of the interface.
Port Idle is nominally a CMOS logical high (+ 3,3 V DC).
Pin 45 and 48: Auxiliary port serial data (SDI2 and SDO2)
The auxiliary port consists of a second half-duplex asynchronous
serial data interface. This port is configured to receive RTCM DGPS
correction data messages.
The default ROM settings for the Auxiliary Serial Data Port are 9600
baud, no parity, 8 data bits, and 1 stop bit. The default may be mo-
dified using custom OEM software.
The serial port settings may also be changed to a new configuration
using binary serial message 1330. The new serial port settings are
stored in SRAM and serial EEPROM. The next time the GPS recei-
ver is powered on or a master reset is initiated, the serial port confi-
guration parameters are accessed in the following priority:
1. If SRAM checksums are valid, the communication parameters
and initialization data parameters will be read from SRAM.
Version 1.03
Limits (*)
0 volts
0,2 x PWRIN volts
50 nanoseconds
25 picofarads
GPS receiver
Units
Side 27