Comdial FX Series Podręcznik - Strona 6
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Connecting Data Devices To The Communications Card
The interface connector between the external device and the communications card is a standard modular jack, and
each serial data communications port supports various baud rates, data bits, stop bits, parity, and flow control.
You can program these various options using database programming. Since the serial data ports are short-run, you
must keep the cabled distance between the data device and the data port to 50 feet or less when operating at data
speeds of 19,200 baud or to 500 feet or less when operating at data speeds of up to 9600 baud.
When preparing a data cable for connection to a data device, refer to the manufacturer's manual for the equipment
being interfaced and make the following wiring connections:
•
Wire the common equipment RD (data from device to common equipment) connection to the device TD
(transmit data) connection.
•
Wire the common equipment TD (data to device from common equipment) connection to the device RD
(receive data) connection.
•
Wire the common equipment SG (signal ground) connection to the device SG (signal ground) connection.
•
If required for proper operation, wire the common equipment CTS (clear-to-send status from device to common
equipment) connection to the device RTS (request-to-send) connection.
NOTE: The common equipment requires a positive voltage, with respect to signal ground, in order to send data.
•
If the cable has spare wires, be sure to ground them so that they will not act as antennas and induce interference
into the system. Further, if there is a source of RF power nearby (such as a radio transmitter), use shielded cable
and ground the shield at both ends.
The default data format is shown in the following chart. Configure the data device that you connect to the
maintenance port to match the charted information.
As an added precaution against induced interference, route the data cable as far away from any
fluorescent lighting as you can reach, and make every effort to route the data cable perpendicular to all
other wiring.
6 – Connecting Data Devices To The Communications Card
Port Type
Baud Rate Data Bit Stop Bit
COM 3–10
19, 200
CAUTION
Installing The Communications Card
Parity Bit
8
1
0