GHM Delta OHM LPPIRG01, Operating Manual, Page: 14 / 26

LPPIRG01
- 14 -
V2.1
4. Within 10 seconds from the pyrgeometer power on, send the @ command and press
Enter.
Note: if the pyrgeometer does not receive the @ command within 10 seconds from
power on, the RS485 MODBUS mode is automatically activated. In such a case, it is
necessary to switch off and on again the pyrgeometer.
5. Send the command CAL USER ON.
Note: the command CAL USER ON is disabled after 5 minutes of inactivity.
6. Send the serial commands given in the following table to set the RS485 MODBUS
parameters:
Command Response Description
CMAnnn &| Set RS485 address to nnn
Ranging from 1 to 247
Preset on 1
CMBn &| Set RS485 Baud Rate
n=0
⇒
9600
n=1 ⇒ 19200
Preset on 1 ⇒ 19200
CMPn &| Set RS485 transmission mode
n=0
⇒
8-N-1 (8 data bits, no parity, 1 stop bit)
n=1
⇒
8-N-2 (8 data bits, no parity, 2 stop bits)
n=2 ⇒ 8-E-1 (8 data bits, even parity, 1 stop bit)
n=3
⇒
8-E-2 (8 data bits, even parity, 2 stop bits)
n=4
⇒
8-O-1 (8 data bits, odd parity, 1 stop bit)
n=5
⇒
8-O-2 (8 data bits, odd parity, 2 stop bits)
Preset on 2
⇒
8-E-1
CMWn &| Set receiving mode after RS485 transmission
n=0
⇒
Violate protocol and go in Rx mode right after Tx
n=1 ⇒ Respect protocol and wait 3.5 characters after Tx
Preset on 1
⇒
Respect the protocol
7. You can check the parameters setting by sending the following serial commands:
Command Response Description
RMA Address Read RS485 address
RMB Baud Rate
(0,1)
Read RS485 Baud Rate
0
⇒
9600
1
⇒
19200
RMP Tx Mode
(0,1,2,3,4,5)
Read RS485 transmission mode
0
⇒ 8-N-1
1
⇒
8-N-2
2
⇒
8-E-1
3 ⇒ 8-E-2
4
⇒
8-O-1
5 ⇒ 8-O-2
RMW Rx Mode
(0,1)
Read receiving mode after RS485 transmission
0
⇒ Violate protocol and go in Rx mode right after Tx
1
⇒
Respect protocol and wait 3.5 characters after Tx
Note: it is not required to send the CAL USER ON command to read the settings.