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DS62-Network, DS62-MD4 Network/Modem Host Module
17
Serial Port Configuration
Handshaking, Baud Rate, Word Size, Stop Bits, and Parity are configured through either the serial or
Ethernet ports using the menus. RTS and DTR Line Drivers can only be configured through the phone
line via a modem. The default settings are 9600bps, 8 data bits, no parity, one stop bit, RTS and
DTR High.
IMPORTANT: Changing the Host module serial port configuration could create a
communications lock-out if the terminal computer serial port configuration does not match the
host module.
Handshaking
For a simple communication between modems three connected lines are needed: TX, Rx, and Ground.
For the data to be transmitted, both sides have to be clocking the data at the same baud rate. While this
method is sufficient for most applications, it is limited in being able to respond to problems such as the
receiver getting overloaded. This is where serial handshaking can help.
Select “Handshaking” and the DS displays with the following:
Default is None
1. Software Handshaking: This style uses actual data bytes as control characters. The lines
necessary are TX, Rx, and ground since the control characters are sent over the transmission
line like regular data. The two control characters, XON and XOFF are characters sent by the
receiver of the data to halt the transmitter during communication.
NOTE: A drawback to this method is also the most important fact to keep in mind. In ASCII
transmissions these character values are non-character values; however, data being transmitted
+----+------+-----------------+------+------+------+------+---------+----+----+
|Port|Device| Device | Baud | Word | Stop |Parity|Handshake|LineDrive|
| | Type | Name | Rate | Size | Bits | | |DTR |RTS |
+----+------+-----------------+------+------+------+------+---------+----+----+
| 1 | RS232| EIA-RS232 | 9600 | 8 | 1 | None | None | HI | HI |
+----+------+-----------------+------+------+------+------+---------+----+----+
Handshaking......................1
Baud Rate........................2
Word Size........................3
Stop Bits........................4
Parity...........................5
RTS Line Driver Inactive State...6
DTR Line Driver Inactive State...7
Enter Request :1
Select handshaking:
1 For None
2 For Software Handshaking
3 For Hardware Handshaking
Enter Request :