3 interfacing, 1 introduction, 2 serial interface – AMT Datasouth 41AY89AR777 User Manual
Page 52: 3 interfacing -1, Introduction -1, Serial interface -1
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3 INTERFACING
3.1 INTRODUCTION
Interfacing with the printer may be accomplished by either of the following two
methods; EIA RS-232-C serial interface or TTL level 8-bit parallel interface.
Connectors for both types of interface are located on the back of the printer as
shown in Figure 1.2.
The first attempt at interfacing should be made by determining the interface
needed, acquiring the correct cable (either serial or parallel) and plugging it into
the correct connector on the printer and the host device. Test data should then be
sent to the printer to see if the interface is complete. If this does not produce the
required results it may be necessary to pursue interfacing at a more detailed level.
In-depth descriptions of serial and parallel interfacing are provided in this
chapter. If interfacing caimot be accomplished by the simpler method described
above, proceed to the applicable paragraph below for more detailed information.
NOTE
When connecting the printer to a host computer system,
always use shielded cables to comply with
FCC rules governing a Class A computing device.
3.2 SERIAL INTERFACE
The printer features an EIA RS-232-C serial .interface which is accessed through
the 15-pin D-coimector on the back of the printer (see Figure 1.2). Although the
RS-232-C interface is considered to be an industry standard, there exists different
cormector pin assignment conventions. For example, pin 2 may not always be
designated serial data ouL Because of such variations it may be necessary to
cormect the interface on a pin-by-pin basis. The technician must compare the
connector pin assignments of the host to the printer and make certain the
interface b made by connector pin assigrunent and not by pm number.
If it is necessary to construct an interface cable, the length of the cable should not
exceed 15 feet On the printer end of the cable use a TRW CINCH (housing no.
DB-51226-1-A, cormect no. DB-25P) or an AMP (housing no. 206478-3, pin no.
66505-4, cormector no. 205208). The cormector pin assigrunent configuration for
the printer serial interface b given in Table 3.1.
3-1