B&B Electronics 3PCIOU4 Documentation Number 3PCI-MIport-4004qsg, EIA-232-E RS-232 Function

EIA-232-E (RS-232)

Function

Shield

Transmit Data (TD)

Receive Data (RD)

Request To Send

(RTS)

Clear To Send (CTS)

DCE Ready (DSR)

Signal Ground (SG)

Received Line Signal

Detector (DCD)

DTE Ready (DTR)

Ring Indicator

PIN #

DB- DB- 25 9

1

23

3 2

47

5 8

6 6

7 5

81

20 4

22 9

TO TO DTE DCE

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THRESHOLD VOLTAGES

SIGNAL

STATE

"0", Asserted, ON,

Space, Active

"1", Disasserted,

OFF, Mark, Inactive

Signal with

Respect to SG

RS-232

+3 to +25 VDC

-3 to -25 VDC

Signal A with Respect to	Signal A with Respect to
Signal B	Signal B
RS-422	RS-485

+2 to +6 VDC (Transmitter) +1.5 to +6 VDC (Transmitter) +0.2 to +7 VDC (Receiver) +0.2 to +12 VDC (Receiver)

-2 to -6 VDC (Transmitter)	-1.5 to -6 VDC (Transmitter)
-0.2 to -7 VDC (Receiver)	-0.2 to -7 VDC (Receiver)

NOTE: Some RS-422 and RS-485 equipment use "+" and "-" descriptors.

The "-" corresponds to "A" and the "+" corresponds to "B".

Documentation Number: 3PCI-MIport-4004qsg

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