Promark 500 as Base sending data over GSM module.

It should be covered in the manual. I believe all 500's came with all options unlike other brands were you bought them one at a time.?ÿ

However, I never used one.

Paul in PA

@paul-in-pa

The manual refers only base configuration with radio modem option .

Unfortunatelly you paid per module. Glonass,GSM,RTK with bases > 5km etc.

yes. The ProMark 500 can use its internal GSM modem for NTRIP.
It can be configured as a base or rover, depending on the setup.
For a base, the receiver can send RTCM corrections through the GSM/GPRS connection to an NTRIP caster, and a rover can then connect to that caster.
The important parts are the modem/APN configuration, the NTRIP caster parameters, the mount point, and the RTCM output configuration.
I have recently been testing this on ProMark 500/800 hardware and it does work, although the configuration is quite sensitive.

Typical setup:

# Set receiver as base
$PASHS,CPD,MOD,BAS,0

# Configure GSM/GPRS
$PASHS,MDM,PAR,PWR,AUT,BND,1,PTC,1,APN,<APN>,LGN,<login>,PWD,<password>,IPT,0,ADL,Y

$PASHS,MDM,ON
$PASHS,MDM,INI

# Check modem
$PASHQ,MDM

# Configure NTRIP caster as server/source
$PASHS,NTR,PAR,ADD,<caster>,PRT,<port>,LGN,<user>,PWD,<password>,TYP,1

# Check NTRIP configuration
$PASHQ,NTR

# Send RTCM3 through internal modem port E
$PASHS,BAS,E,RT3

# Check RTCM output
$PASHQ,BAS
$PASHQ,RTC,MSI

# Connect to the mount point
$PASHS,NTR,MTP,<mountpoint>