Panasonic IMC80A specifications Configuration of Data Block, Protocol Parameter

Communications

Configuration of Data Block

A data block to be transmitted in physical phase is configured as illustrated below:

1 byte

N

axis

mode command

Parameter

(N bytes)

check sum

N	: This is the number of command bytes (0 - 240),
	which indicates the number of parameters needed by a command.
axis	: This defines a module ID assigned to parameter No.00 axis name of the driver. (1 - 15)
command	: This is the control command (0 - 15).
mode	: This is the command execution mode (0 - 15),
	which differs depending on a command.
check sum	: This is 2’s complement of the total number of bytes, ranging from the first byte to the byte immedi-
	ately before the checksum byte.

Protocol Parameter

The following parameters can control transfer of a block. A user can set these parameters to any value with INIT command to be described later.

	Name		Function	Initial Value	Range of Settings	Unit
		T1	Timeout between character transmissions	5 (0.5 second)	1 - 255	0.1 second
		T2	Protocol time limit	10 (10 seconds)	1 - 255	1 second
		RTY	Retry limit	1 (once)	1 - 8	once
		M/S	Master/slave	0 (slave)	0, 1(master)
T1 .... •		This is allowable time between module identification byte and ENQ/EOT, or time from reception of a
		character code by this device to that of a next character code in a transmission/reception data block.
		When this specified time is exceeded, timeout error occurs and NAK is returned to the transmitting
		module.
T2 .... •		This is allowable time after this device transmits ENQ till it receives EOT. When this specified time is
		exceeded, it means that the receiving module is not ready to receive data or fails to receive ENQ code
		for some reason. In this case, ENQ code will be resent to the receiving module (number of retries).

•This is allowable time after EOT is sent out till a first character is received. When this specified time is exceeded, NAK is returned and the receiving mode ends.

•This is allowable time after checksum byte is sent out till ACK is received. When this specified time is exceeded, ENQ code is resent to the receiving module, as in the case of reception of NAK.

RTY ..... This shows the maximum number of retries. When this specified value is exceeded, transmission error

occurs.

M/S ..... This shows switching of a master/slave. When conflict of ENQ transmission occurs, this parameter

determines to which priority is given. (0=slave mode, 1=master mode) Transmission of the module defined as a master should take precedence.

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