Truth tables ST485B - ST485C
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2 Truth tables
Note: X = Don’t care; Z = High impedance
Note: X = Don’t care; Z = High impedance
Table 3. Truth table (driver)
Inputs Outputs
RE DE DI B A
XHHLH
XHLHL
XLXZZ
Table 4. Truth table (receiver)
Inputs Outputs
RE DE A-B RO
LL
≥ +0.2V H
LL
≤ -0.2V L
L L Inputs open H
HLX Z
