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RD
CTS
DSR
SN75189 or equivalent
SN75188 or equivalent
TD
RTS
DTR
(16) Interface Circuit
z Input Circuit
z Output Circuit
z Signal Levels
Input Voltage H ......+3 ~ +15 V
L.......-3 ~ -15 V
Output Voltage H ......+6 ~ +13 V
L.......-6 ~ -13 V