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The RS-232 or RS-485 port can communicate with a remote computer (e.g., SCADA) system. The danger and
critical set points are purposely not able to be set over the serial interface. All commands must be terminated by a
carriage-return <CR>. A line-feed <LF>, if sent, is ignored. The responses from the GD-1000 are all terminated by a
carriage-return <CR> and a line-feed <LF>.
Command: MSV n
Read Measured Values – Reads up to two gas sensor readings. "n" is the channel number. If "n" is not specified,
both channels are transmitted and are separated by a comma. The alarm status is also transmitted.
CH1 (Cl2) =
0.1ppm,OK, CH2 (SO2) =
The gas type is in parenthesis (Cl2, SO2, O3, NH3, CO, H2S, or ClO2).
The gas unit is either "ppm" or "mgl," which is set by CFG parameter UNITS.
STATUS: OK (no alarms), DGR (danger), CRT (critical) or DLY (power up stabilization time delay).
When the power up sensor stabilization time delay is active, the sensor concentration sent is forced to zero (0).
Command: ACK
Acknowledge the audible alarm if active.
Command: CLK {yyyy-MM-ddThh:mm:ss}
Read/set the real time clock using the ISO 8601 standard.
Read response (send CLK<CR>): CLK 2008-10-17T07:46:45<CR><LF>
The clock is set using the same serial format.
Command: RFW
Read the firmware version number.
Response: RFW4.00<CR><LF>
Command: EVL n
Download the event log. The "n" is the channel number, which is either a 1 (0x31) or 2 (0x32). See the EVENT LOG
section of this manual for more information.
Send: EVL1<CR> and then EVL2<CR> to list the events for both channels.
LOG REPORT: CH1
2018/08/06,13:27:49,CRT,MAX=
2018/08/06,13:20:06,CRT,MAX=
2018/08/06,13:05:50,CRT,MAX=
2018/08/02,13:08:26,CRT,MAX=
2018/08/02,13:07:33,CRT,MAX=
2018/08/02,11:53:31,DGR,MAX=
END
LOG REPORT: CH2
2018/08/06,13:27:49,CRT,MAX=
2018/08/06,13:20:06,CRT,MAX=
2018/08/06,13:05:50,CRT,MAX=
2018/08/02,15:14:31,CRT,MAX=
2018/08/02,15:13:47,CRT,MAX=
2018/08/02,15:13:12,DGR,MAX=
2018/08/02,15:12:59,CRT,MAX=
2018/08/02,11:49:54,DGR,MAX=
END
Command: EVLCLR
Clear up to 250 event log entries.
RS-232/RS-485 SERIAL COMMANDS
GAS SENSOR TYPE: Chlorine
3.5,AVG=
3.3,DURATION=00:01:16
3.5,AVG=
3.5,DURATION=00:04:59
3.5,AVG=
3.4,DURATION=00:11:33
4.4,AVG=
1.9,DURATION=00:00:16
4.4,AVG=
3.9,DURATION=00:00:08
2.0,AVG=
1.6,DURATION=00:00:01
GAS SENSOR TYPE: Sulfur Dioxide
3.3,AVG=
2.7,DURATION=00:01:14
3.3,AVG=
3.3,DURATION=00:04:59
3.3,AVG=
3.2,DURATION=00:11:55
3.2,AVG=
0.9,DURATION=00:42:54
4.1,AVG=
2.3,DURATION=00:00:11
1.2,AVG=
1.1,DURATION=00:00:13
6.0,AVG=
3.8,DURATION=00:00:10
1.4,AVG=
1.2,DURATION=00:00:01
10.0ppm,CRT,<CR><LF>
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