Operator`s manual

SECTION 6.
INTERFACE SPECIFICATIONS
INTRODUCTION
This section presents the interface specifications for the XL Series printers. These
specifications include detailed information on how to properly interface your printer
with your host system.
The following information is presented in this section:
• Interface Types
• Using the Receive Buffer
• RS32C Serial Interface
General Specifications
Electrical Specifications
Pin Assignments
Ready/Busy Flow Control
X-On/X-Off Flow Control
Bi-Directional Communications Protocol
• Centronics Parallel Interface
• Accessory (EXT) Connector
INTERFACE TYPES
In order to provide flexibility in communicating with a variety of host computer
systems all XL printers can be configured for operation with either parallel or serial
data transfers. Both the XL400 and the XL410 come standard with two interface types.
The Centronics Parallel interface will probably be the most useful in communicating
with IBM PCs and compatibles. The RS232C Serial interface allows connectivity to a
number of other hosts. For instructions on how to properly configure your XL printer
for either of these interface types, see Section 3. Configuration for instructions.
NOTE: Both the Centronics and RS232C interfaces are active at the same time on
theXL printers, i.e. data can be received on either one, however no provision is
made for port contention. If data is transmitted to both ports simultaneously, it will
cause the data in the receive buffer to be corrupted.
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