G203 user manual
Everything you need to install, configure, and troubleshoot the G203 GSM gate opener module — including the default password, every SMS command, the wiring diagram, and the original manufacturer PDF.
At a glance: The G203 is a GSM gate opener module manufactured by Callny / Daniu GSM / LPSECURITY. The default password is 1234. It supports up to 999 authorized phone numbers across 1 relay output and runs on DC 9-36V. Commands are sent over SMS using the Callny protocol.
Download the official PDF manual
The original Callny / Daniu GSM / LPSECURITY factory manual in PDF form:
Download G203 manual (PDF)If the PDF is missing diagrams or your hardware shipped with a different version, please let me know and I will add the alternative version.
Hardware specifications
| Default password | 1234 |
|---|---|
| Maximum authorized users | 999 |
| Relay outputs | 1 |
| Protocol family | Callny |
| Power supply | DC 9-36V |
| SIM card type | Nano SIM |
| Relay rating | 3A / 240VAC |
| Operating temperature | -10 to +60 C |
| Dimensions | 96.5 x 50 x 31.5 mm |
These are the manufacturer's published values. The same hardware is sold under several brand names — if your unit shows a different sticker, the protocol and command set are still identical. Also known as: G203, CN G203.
First-time setup checklist
Before sending any SMS commands, work through this list. Skipping a step accounts for most of the support emails I receive.
- Insert a working SIM card into a regular phone. Confirm voice and SMS work. Disable the SIM PIN.
- Insert the SIM into the G203. Connect DC 9-36V.
- Wait for the signal LED to blink slowly (network registered). This takes 30-90 seconds on first power-up.
- From an authorized phone, send the change-password command to replace the default
1234with your own. - Add yourself as the first authorized user. Confirm by calling the SIM number — the gate should pulse.
- Wire the relay output to your gate motor's trigger input (typically labelled "ON", "MAN", "OPEN").
The detailed setup walkthrough with example SMS commands is in the G203 setup guide.
SMS command reference
Every command for the G203, copy-pasteable. Replace {pwd} with your own password. The full annotated reference with response examples is on /hardware/callny-g203/commands/.
Add admin user (auto-assign slot)
Add admin user with auto-assigned slot ID
{pwd}#TEL{phone}#DEF#1234#TEL+31612345678#DEF#Add admin user (specific slot)
Add admin user with specific slot ID (001-999)
{pwd}#TEL{phone}#{userID}#1234#TEL+31612345678#001#Add normal user (auto-assign, G203 only)
Add normal user (can only call to open, cannot manage users)
{pwd}#NORTEL{phone}#DEF#1234#NORTEL+31612345678#DEF#Add normal user (specific slot, G203 only)
Add normal user with specific slot ID
{pwd}#NORTEL{phone}#{userID}#1234#NORTEL+31612345678#005#Delete user by slot
Remove user by slot ID. Super admin cannot be deleted.
{pwd}#TEL#{userID}#1234#TEL#002#Delete user by phone
Remove user by phone number
{pwd}#DELTEL#{phone}#1234#DELTEL#+31612345678#Query user by slot
Check which phone number is in a slot
{pwd}#TEL{userID}?1234#TEL001?Query user by phone
Check if a phone number is authorized
{pwd}#QRYTEL{phone}?1234#QRYTEL+31612345678?Query all users
List all authorized users with roles
{pwd}#TELALL?1234#TELALL?Relay ON (pulse)
Turn relay on for the configured delay time
{pwd}#ON#1234#ON#Troubleshooting
If a command returns Error password, double-check that you are sending the command from an authorized phone using exactly the syntax above. The Callny firmware is strict about case, spacing, and the # delimiters. Common causes:
- Sending from a number that is not on the authorized list (call the gate first to test).
- Old password still cached after a factory reset. The post-reset default reverts to
1234. - Lowercase command keywords. Callny commands accept lowercase, but spacing matters.
- Extra spaces or autocorrect inserted by your phone keyboard. Disable predictive text for the gate's SIM number.
The full troubleshooting guide with diagnostic SMS commands and signal-strength checks lives at rtu5024-troubleshooting.
Skip the SMS commands entirely
The whole reason this site exists is that nobody enjoys typing SMS commands like {pwd}#TEL+31612345678#001# from memory. GateOpener gives you buttons, forms, and confirmation screens — same hardware, clean interface.