Gtco MM II 1201 - Users Guide Bedienungsanleitung PDF herunterladen (Seite 11)

MM II 11

The interface accommodates RS-232C and TTL. (Do not use both at the same time.)

RS-232C – CITTL Interface: 25-Pin D Connector Pin Assignments

Wire Name

Description

GND

TXD

RXD

signal ground

+12 VDC

TXD

Protective, frame ground

Transmits data to host (RS-232C only)

Receives data from host (RS-232C or TTL)

Return for data

Power to tablet from host

Transmits data to host (TTL only)

Pin 9 is for powering the tablet from the host. The host must supply a +12 VDC at 250 mA,

less than 50 mV ripple, +/-10% regulation and a rise time less than 100 milliseconds.

CAUTION:

 Never power the tablet from the power supply and host simultaneously.

 Pin 9 and the power supply socket are connected inside the 25-pin D connector.

Therefore, power applied to one, also exists on the other. Ensure that nothing is

attached to the source not in use.

RS-232C Interface

The RS-232C lines are configured as DTE (Data Terminal Equipment). The signal levels

comply with standard signal levels for data transmission:

RS-232C Signal Levels

RS-232C Interface

Interchange Voltage

-3V to -12V

+3V to +12V

Binary states

Signal condition

Mark

Space

NOTE: The source is the EIA Standard RS-232C: Interface between Data Terminal

Equipment and Data Communication Equipment Employing Serial Binary Data

Interchange, by the Engineering Department of the Electronic Industries Association

(Washington, D.C.: EIA, 1969).

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Gtco MM II 1201 - Users Guide Bedienungsanleitung Seite 11