Grass Valley Performer-HD - Manual (Page 48)

3-16 Performer-HD Instruction Manual
Section 3 — Operation and Maintenance
SMPTE 3245-E Protocol
Performer-HD may be controlled by a host computer using SMPTE 3245-E
protocol if the proper switches on the Performer-HD have been set. The
SMPTE 3245-E protocol is based on the following SMPTE standards docu-
ments:
■ Remote Control Systems for Television Production Equipment, Tech
3245-E, December 1984.
■ Remote Control Systems for Broadcasting Production Equipment: Sys-
tem Service and Common Messages, Supplement 1 to Tech 3245-E, June
1986.
■ Remote Control System for Broadcasting Equipment, Routing Switcher
Type-Specific Messages, Draft 0.1, July 1988.
Performer-HD has no non-standard communication sequences used with
the SMPTE ESCAPE sequence. If Performer-HD is selected and the SMPTE
ESCAPE character received, Performer-HD will enter the IDLE state and
call protocol error.
On reset, Performer-HD assigns itself to the SMPTE all-call group address
and clears all other group assignments.
Performer-HD does not make entries in the bus controller linkage directo-
ry. This must be handled by another device on the bus.
Performer-HD is a single virtual machine. Messages for selecting virtual
machine are NOT supported.
SMPTE standard (1984) shows the receive values for the ASSIGN state to
be 00-0F, 80-FF. This appears to be an error. It is 00-7F for deassignment and
80-FF for assignment.
SMPTE BUSY status (06H) is never returned by Performer-HD.
Protocol error is called when a protocol error occurs. Receive error is called
when a message we send is NAK’d by the bus controller or when a message
with a bad checksum is received.