Rev 1.0; Data Format; Rev 1.91 (19 April 2004); Command Structure - Classe Audio Delta Series Service Manual

Appendix B2: CAP2100 RS-232 Interface
Rev 1.91
Revision History:
1.1 added IR code command and LCD low power control, selectable baud
1.2 added amplifier fault times status and tape monitor control
1.3 changed fault time status to include days, added running time status
1.4 modified IRC spec for 3 digit IR code
1.5 modified thermal values returned in status to match amplifier standard
1.6 removed tech items
1.7 added DC and internal comms faults in SYS FAULT status
1.8 updated the STAT FAULT code letters
1.9 added the T1_0, T1_1, T2_0, T2_1

Data format

The RS232 communication with the CAP-2100 operates with a UART configuration for 9600
baud, 8 bits, no parity, with one stop bit. System setup for the CAP-2100 allows for other baud
selections. There is no minimum time between bytes required, as the CAP-2100 allows for a 16
byte FIFO. The PC or home controller system similarly must accept status data without delays
between bytes from the CAP-2100. All command and status data are ASCII bytes.

Command structure

All commands and status strings follow a format which include 4 leading bytes which serve as
the address of the command. The address and command fields are separated by a period and zero
or more space characters. The end of the command line is identified by a carriage return/line
feed.
For the CAP-2100, the address field is "AP21". The address data and the period delimiter may be
omitted if the controller/PC uniquely connects to the CAP-2100. Any commands that are
received without an address field are interpreted for local operation.

Command strings

The command strings consist of all ASCII characters between the period and carriage return.
Leading blanks in the command string are ignored. The following list of commands are
recognized by the CAP-2100:
MAIN n
INP+
INP-
VOLM vv.v
VOL+
VOL-
MUTE
UNMT
CA(P)2100 AMP Service Manual v1.4 inc voltage change info .doc
(19 April 2004)
change main input to input number n
steps to the next input
steps to the previous input
sets volume to vv.v, or the nearest possible value, mute disengaged
*steps the volume up from current, mute disengaged
*steps the volume down from current, mute disengaged
if not muted, engage mutes and adjusts volume
if muted, disengages mute and returns to premute volume level
Page 40 of 50