Bc2000 (for the BCF2000 & BCR2000)

01 71 - 02 0F

MinValue = 241
high byte = 01 hex (standing for 128)
low byte = 241-128 = 113 = 71 hex

MaxValue = 271
high byte = 02 hex (standing for 256)
low byte = 271-256 = 15 = 0F hex

"I can't seem to set the Value 1/Value 2 knobs on the Custom Output tab that precisely."

See section 20 of the BC Manager manual.