User Guide

HDV100A3 Command & Response Manual-1306cr 5
B&B Electronics -- 707 Dayton Rd. -- PO Box 1040 -- Ottawa, IL 61350
PH [phone] -- FAX [phone]
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
of
Frame
Control
Bytes
Command
Code
Function
Code
UB3 Baud
1
Baud
2
Data
Bytes
Check
Sum
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
Latch
Set
Break
Set
Parity
Even
Parity
Parity
Enable
Stop
Bits
Word
Length 1
Word
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