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Technical Description

Sealevel Systems IC485+ Page 9

Technical Description

The Sealevel Systems IC485+ converts an existing RS-232 serial port into a field selectable RS-422/485 port for

industrial automation and control applications.

Connector Pin Assignments

RS-232 Signals (DB-25 Female)

Signal Name Pin # Mode

GND Ground 7

RD Receive Data 3 Input

CTS Clear To Send 5 Input

DSR Data Set Ready 6 Input

DCD Data Carrier. Detect 8 Input

RI Ring Indicator 22 Input

TD Transmit Data 2 Output

RTS Request to Send 4 Output

DTR Data Terminal Ready 20 Output

Note: These assignments meet EIA/TIA/ANSI-232E DTE

Technical Note: The modem control signals are biased in the following fashion: RTS and CTS are connected,

DTR is connected to DCD and DSR, and RI is tied inactive.

RS-422/485 Pin Assignments (6 Position Screw Terminal)

Signal Name Pin # Mode

RDB RX+ Receive Data Positive 1 Input

RDA RX- Receive Data Negative 2 Input

TDB TX+ Transmit Data Positive 3 Output

TDA TX- Transmit Data Negative 4 Output

GND GND Ground 5

SHIELD SH Shield 6

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 17 18 19

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Impulse 1102 Manual do Utilizador Página 11