D-11
Appendix D: Interface Data
RS-422A Serial Interface
The RS-422A interface is often used when data is transmitted over
long distances (max. 1.2 km). The type of data transmission is the
same as used by the RS-232C interface, but the pin assignment and
the signal levels are different. The transmission parameters of the
RS-422A interface (configuration) on the printer side must therefore
correspond to the system’s parameters in this case as well.
Jumper SP1
The position of jumper plug SP1 should never be changed. If the
interface’s control program is stored in the microprocessor, SP1 has
to connect the two pins close to the interface connection (Position
1). If the control program is stored in the EPROM, SP1 has to con-
nect the two pins pointing away from the connection (see figure).
The interface cable has to meet the following requirements:
37-pin plug: equivalent to DC-37P
Plug housing: equivalent DC-C1-J16.
Interface boards may vary in
design.
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