Wiring
19
Definition
EIA/TIA-232 (RS232) is a voltage mode digital communication using up to ±12 V
DC
, and requires
a variety of signals depending on the operating mode (software selectable):
RS-232 Cable Specification
Signal Basic RS232 Fully RS232 with
Hardware Handshaking
(in preparation)
Remarks
Shield Required Required Copper braided or combined foil and braided shielding
G Required Required
RxD Required Required
TxD Required Required
RTS Required
Null Modem connection, these two pins can be linked
together
CTS Required
DTR Required
Null Modem connection, these three pins can be linked
together
DSR Required
CD Required
RI Optional Not required
Cable capacitance ≤ 50 pF/m
Core cross-section ≥ 0.34 mm
2
(AWG 22) multi-strand cable is preferred
Cable type Single cable or twisted pair
Cable resistance ≤ 110 Ω/km
Signal damping Max. 9 dB over the entire length of the cable cross-section
Shielding Copper braided shielding or combined foil and braided shielding
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