Quantum Data 881, User Manual

Page: 761 / 1144

882 Video Test Instrument User Guide (Rev A.35) 383
I2CR? (OUT1:I2CR?, OUT2:I2CR?, VGA:I2CR?)
I2C port Read
Class EDID and DDC control
Description Automatically reads data using a specified I2C protocol. This command reads data from
the specified connector, bus and device using the I
2
C bus. If no connector is specified, the
query defaults to OUT1 or VGA depending on the active output. All numeric parameters
are given in ASCII HEX.
Note: EDID-compatible receivers use EPROMs with single-byte or double-byte
addresses. The I2CR? query uses different parameters depending on the EPROM
type. To determine which EPROM type is used, try both syntaxes until you can read
data from the EPROM.
Query syntax
(EPROM with
single-byte
addresses)
connector :I2CR? bus_name i2c_address offset #_of_bytes
Query syntax
(EPROM with
double-byte
addresses)
connector :I2CR? eprom1 i2c_address offset #_of_bytes
Query syntax (device
protocol)
connector :I2CR? bus_name i2c_address offset #_of_bytes
connector
OUT1, OUT2 = HDMI OUT 1 or HDMI OUT 2 connector
VGA = VGA connector
bus_name (optional - text)
device queried(eprom, eprom1, TV, DT, HT, HR)
i2c_address (hex)
i
2
c bus address (A0, A1,...)
offset (hex)
address offset (in bytes)
#_of_bytes (hex)
number of bytes
Example 1 This example reads 10 bytes of E-EDID data, using the I2C e_ddc protocol.
R:\>i2cr? eprom a0 80 10
02031A76478502030406070123090707