Specifications

##$$$#

(
+,+-!
This is an advanced version of byte mode which allows transfer of data in either direc-
tion without returning to the compatibility mode. The communication is a half-duplex
channel with either device, the host or the printer, making a request for data transfer
when there is available data. In the case of simultaneous requests for transfer, the
printer always defers to the host.
+,+-!
Printer-host communication is done via asynchronous bidirectional eight-bit transfer. A
return to compatibility mode is not required.
!
Printer-host communication is done in nibbles (four bits; one-half byte) with the low
order nibble sent first. A transfer of two nibbles is required for each byte of informa-
tion.
EDNord - Istedgade 37A - 9000 Aalborg - telefon [phone]