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gmc-320 AT Commands

Submitted by abitowhit on Sun, 03/04/2018 - 19:08

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Raspberry Pi

Command set from http://www.gqelectronicsllc.com/download/GQ-RFC1201.txt

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GQ-RFC1201

GQ Geiger Counter Communication Protocol
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Ver 1.40    Jan-2015

Status of this Memo

This document specifies a GQ GMC Geiger Counter Communication Protocol for the
   communication between GQ GMC Geiger Counter and a computer host via serial port, and requests discussion and suggestions for
   improvements.  Distribution of this memo is unlimited.

Copyright Notice

Abstract

This document defines a GQ GMC Geiger Counter Communication Protocol
   to support communication between GMC Geiger Counter and a computer host via serial port.  The protocol allows to send data request command from a computer host to a GQ GMC geiger counter.

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Serial Port configuration
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For the GMC-300 V3.xx and earlier version, the serial port communication is based on a fixed baud rate.

Baud: 57600
Data bit: 8
Parity: None
Stop bit: 1
Control: None

For the GMC-300 Plus V4.xx and later version firmware,  115200 BPS is used.

For GMC-320, the serial port communication baud rate is variable. It should be one of the followings:

1200,2400,4800,9600,14400,19200,28800,38400,57600,115200 BPS.  The factory default is 115200 BPS.

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Command format
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A valid command start with ASCII '<'  and ended with ASCII '>>'. Both command and parameters are in between '<' and '>>'.

Command is a ASCII string. All parameters of command are true value in hexadecimal.

Direction: All commands are initiated from computer(HOST).

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Commands
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1. Get hardware model and version

Command:  <GETVER>>

Return:   total 14 bytes ASCII chars from GQ GMC unit. It includes 7 bytes hardware model and 7 bytes firmware version.

e.g.:  GMC-300Re 2.10

Firmware supported:  GMC-280, GMC-300 Re.2.0x, Re.2.10 or later

2. Get current CPM value

Command:  <GETCPM>>

Return:   A 16 bit unsigned integer is returned. In total 2 bytes data return from GQ GMC unit. The first byte is MSB byte data and second byte is LSB byte data.

e.g.: 00 1C     the returned CPM is 28.

Firmware supported:  GMC-280, GMC-300 Re.2.0x, Re.2.10 or later

3. Turn on the GQ GMC heartbeat

Note:     This command enable the GQ GMC unit to send count per second data to host every second automatically.

Command:  <HEARTBEAT1>>

Return:   A 16 bit unsigned integer is returned every second automatically. Each data package consist of 2 bytes data from GQ GMC unit. The first byte is MSB byte data and second byte is LSB byte data.

e.g.: 10 1C     the returned 1 second count is 28.   Only lowest 14 bits are used for the valid data bit.  The highest bit 15 and bit 14 are reserved data bits.

Firmware supported:  GMC-280, GMC-300  Re.2.10 or later

4. Turn off the GQ GMC heartbeat

Command:  <HEARTBEAT0>>

Return:   None

Firmware supported:  Re.2.10 or later

5. Get battery voltage status

Command:  <GETVOLT>>

Return:   one byte voltage value of battery (X 10V)

e.g.: return 62(hex) is 9.8V

Firmware supported:  GMC-280, GMC-300 Re.2.0x, Re.2.10 or later

6. Request history data from internal flash memory

Command:  <SPIR[A2][A1][A0][L1][L0]>>

A2,A1,A0 are three bytes address data, from MSB to LSB.  The L1,L0 are the data length requested.  L1 is high byte of 16 bit integer and L0 is low byte.
	
	The length normally not exceed 4096 bytes in each request.
 
Return: The history data in raw byte array.

Comment: The minimum address is 0, and maximum address value is the size of the flash memory of the GQ GMC Geiger count. Check the user manual for particular model flash size.

Firmware supported:  GMC-300 Re.2.0x, Re.2.10 or later

7. Get configuration data

Command:  <GETCFG>>

Return: The configuration data.  Total 256 bytes will be returned.

Firmware supported:  GMC-280, GMC-300 Re.2.10 or later

8. Erase all configuration data

Command:  <ECFG>>

Return: 0xAA

Firmware supported: GMC-280, GMC-300 Re.2.10 or later

9. Write configuration data

Command:  <WCFG[A0][D0]>>
	
	A0 is the address and the D0 is the data byte(hex).

Return: 0xAA

Firmware supported: GMC-280, GMC-300 Re.2.10 or later

10. send a key

Command:  <key[D0]>>
	
	D0 is the key value from 0 to 3. It represents software key S1~S4.  
Return: none

Firmware supported:  GMC-280, GMC-300 Re.2.0x, Re.2.10 or later

Note: for Re.2.11 or later, each key can be a ASCII string: <KEY0>>,<KEY1>>,<KEY2>>,<KEY3>>

11. get serial number

Command: <GETSERIAL>>

Return: serial number in 7 bytes.

Firmware supported: GMC-280, GMC-300 Re.2.11 or later

12. Power OFF

Command: <POWEROFF>>

Return: none

Firmware supported: GMC-280, GMC-300 Re.2.11 or later

13. Reload/Update/Refresh Configuration

Command: <CFGUPDATE>>

Return: 0xAA

Firmware supported: GMC-280, GMC-300 Re.2.20 or later

14. Set realtime clock year

command: <SETDATEYY[D0]>>

D0 is the year value in hexdecimal
	
Return: 0xAA