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/PUP - Program Up
/PDN - Program Down
/PTM - Turn Test Mode On
/Brx - Set the baud rate
1 - 300
2 - 600
3 - 1200
4 - 2400
/KBL - Lock Keyboard
/KBU - Unlock Keyboard
?PR# - Send Current Program Number
?BRQ - Send current baud rate
1 - 150
2 - 300
3 - 600
4 - 1200
5 - 2400
?CNQ - Send Concentration (three bytes)
conc
decimal point
unit
m - ppm
b - ppb
t - ppt
u - pcu
h - pH
?ERR - send error / status information
0 - No error
1 - CAP
2 - HI
3 - ZERO
4 - LO
5 - IDLE
6 - ZERO DONE
7 - TIMED READ