ICPDAS GPS-721-MRTU Quick Start Manual
GPS-721-MRTU
GPS Receiver and 1 DO, 1 PPS Output
Module
Quick Start Guide
This manual introduces the user to the methods used to implement the GPS-721-MRTU
module into their applications in a quick and easy way, and will only provide basic
instructions. For more detailed information, please refer to the GPS-721-MRTU user
manual located on the ICP DAS CD-ROM, or download it from the ICP DAS web site:
https://www.icpdas-usa.com/gps_721_mrtu.html
1. Pin Assignments and LED Indicators
Pin Assignments
GPS-721-MRTU
GPS-721-MRTU GPS Receiver - QuickStart (Jan/2019)
ICP DAS USA, Inc. | www.icpdas-usa.com | 1-310-517-9888 | 24309 Narbonne Ave. Suite 200. Lomita, CA 90717
1
LED
Status
Description
Sys.
ON
The module is operating/functioning correctly
OFF
The module has encountered an error
DO1
ON
Digital Output is active
OFF
Digital Output is inactive
S1 ON
Fewer than 5 signals received from GPS satellites.
OFF
Module is unable to receive sufficient GPS signals
ON
The number of signals received from GPS satellites is 5
S2
to 8
OFF
The number of signals received from GPS satellites is
less than 5
ON
The number of signals received from GPS satellites is
S3
more than 8
OFF
The number of signals received from GPS satellites is
less than 8
1 PPS
ON
The PPS signal is active
OFF
The PPS signal is inactive
LED Indicators
GPS-721-MRTU GPS Receiver - QuickStart (Jan/2019)
ICP DAS USA, Inc. | www.icpdas-usa.com | 1-310-517-9888 | 24309 Narbonne Ave. Suite 200. Lomita, CA 90717
2
Mode
Description
After setting the module to “INIT” mode and restarting the
module, a connection can be established using the default
module address and communication settings, allowing
new parameters for the module to be set.
INIT Mode:
INIT
Protocol: DCON
Module Address: 00
Communication Baud Rate: 9600bps
Checksum: Disabled
Note: The DCON command to set the address, the Baud
Rate and the checksum is %AANNTTCCFF. Refer to
section 2.1 for details.
Normal
In Normal mode, the module will operate based on the
user’s settings.
2. Operation Modes
The back panel of the GPS-721MRTU contains the frame ground
and the INIT/Normal Switch. The
module has two operation modes
(INIT and Normal modes), which
can be determined via the switch
mechanism on the chassis. The
description and figure are as
follows.
GPS-721-MRTU GPS Receiver - QuickStart (Jan/2019)
ICP DAS USA, Inc. | www.icpdas-usa.com | 1-310-517-9888 | 24309 Narbonne Ave. Suite 200. Lomita, CA
90717
3
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