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Appendix B

Print Engine Communications Interface Technical Information

System Considerations

Communications Code — The print engine sends and receives American Standard

Code for Information Interchange (ASCII). This code consists of 128 characters (256

for Code Page 850) including upper and lower case letters, numbers, punctuation

marks, and various control codes.

Interfaces — The method of interfacing the print engine to a data source depends on

the communication options installed in the print engine and the host. The standard inter-

faces are an RS-232/RS-422/RS-485 serial data port and a Centronics-compatible paral-

lel port. Optional IBM Twinax, IBM Coax and Ethernet options are available for those

applications which require them.

Data Specifications — When communicating via an asynchronous serial data port

(RS-232/RS-422/RS-485), the baud rate, number of data and stop bits, the parity, and

the XON/XOFF or DTR control are user-selectable and should be set to match those of

the host computer. When communicating via the Centronics-compatible parallel port,

the previously mentioned parameters are not considered. Refer to “Configuration and

Calibration” to configure the communication parameters for the print engine.

Interface Considerations

RS-232 – A serial communication method consisting of data and control signals; avail-

able as a standard feature on most PCs and other hosts.

Advantages: Cables and connectors are readily available from computer equipment

stores and suppliers; easy to connect; two-way communication between the host and the

print engine.

Disadvantages: Slower than the parallel connection; limited to 50 feet (15.24 meters) of

cable.

RS-422 – A single-user current loop serial communication method.

Advantages: Longer cable length up to 4000 feet (1219.2 m); greater immunity to data

corruption caused by industrial motors and fluorescent lights; two-way communication

between the host and the print engine.

Disadvantages: Not commonly available on standard PCs without additional hardware;

slower than the parallel connection.

RS-485 – A multiple-user current loop serial communication method that is used to

support multiple print engines connected to a single host.

Advantages: Longer cable length up to 4000 feet (1219.2 m); greater immunity to data

corruption caused by industrial motors and fluorescent lights; two-way communication

between the host and the print engine.

Disadvantages: Not commonly available on standard PCs without additional hardware;

slower than the parallel connection.

Centronics-compatible Parallel – This is a common communication method available

on most PCs and other hosts.

Advantages: Fastest of the four communication interfaces; cables and connectors are

readily available from computer equipment stores and suppliers; easy to connect.

Disadvantages: Shorter recommended cable length of 6 feet (1.83 m).

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Zebra 170PAX2 Series Guía de usuario Pagina 75

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