QMS VMS Software Manual page 24

Interface for qms crown printers
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When you press the Select key after you've entered the last digit,
the printer momentarily displays the address you selected and
then returns to the DECNET-TCP/IP menu.
13 Press the Online/Offline key to put the printer back on line.
The new DECnet address takes effect immediately after you turn
the printer off and on again.
By default, this option is Disabled. When Enabled, this option allows
the printer to send printer error and emulation-generated backchannel
messages to the host system if the Hot Status Listener (HSL) applica-
tion has been installed on the host.
This option is set to 558 bytes by default. It is the minimum packet
size which will be sent by the printer to the host. This packet size is
read only if the host sending data to the printer is not in the same
area. This value can change based upon the type of router being
used.
The default setting for this option is Enabled to allow the maintenance
of a routing table. This routing table permits the printer to communi-
cate through a router when necessary.
QMS Crown printers support a new protocol for communication
between the printer and a host computer over a serial, parallel, or
optional interface connection. This new protocol is called PS protocol.
This binary communications protocol (BCP) allows any 8-bit binary
value (0-255) to be treated as data, while allowing a few of the values
to function as special control characters. When communicating 8-bit
binary data in binary, binary fixed, quoted binary, or quoted binary

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