RS-232 Baud Rate Setup

To set the baud rate for the RS-232 port, set a general command code of 08. Set the function code to 01. Then set 3 control bytes as follows.

Function	Start	Control	Command	Function	UB3	Baud	Baud	Data	Check
	of	Bytes	Code	Code		1	2	Bytes	Sum
	Frame
Byte #	1	2	3	4	5	6	8	9	10
Value	01	05	08	01				00

Setting UB3

Bit 7	Bit 6	Bit 5	Bit 4	Bit 3	Bit 2	Bit 1	Bit 0
Divisor	Set	Set	Even	Parity	Stop	Word	Word
Latch	Break	Parity	Parity	Enable	Bits	Length 1	Length 0

Bit 7 = 1 allows baud rate divisor to be changed. 0 baud rate change is blocked. Bit 7 should not be set. The setting and resetting of this bit is handled internally.

Bit 6 = 1 forces the transmitter output to a logic 0 for alerting the remote receiver to a line break. 0 indicates no break condition.

Bit 5, 4 and 3 work together to set parity

	Bit 5		Bit 4	Bit 3	Parity Selection
	*		*	0	No parity (default)
	0		0	1	Odd parity
	0		1	1	Even parity
	1		0	1	Force parity “1”
	1		1	1	Force parity “0”
		*Don’t care state.
Bit 2, stop bit, works in conjunction with bits 1 and bit 0

	Bit 2		Word Length (bits)			Stop Bit Length
	0		5,6,7,8			1 (default)
	1		5			1½
	1		6,7,8			2

HDV100A3 Command & Response Manual-1306cr					5

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