Bay Technical Associates DS74 - Manual (Page 7)

DS74 Serial I/O Module
7
Status
Displays the current configuration of each I/O port.
Serial Port Configuration
Since the DS74 I/O modules use different serial port configurations. Handshaking, Baud Rate, Word Size,
Stop Bits, and Parity can all be configured through the HOST module using the menus. The default settings
are 9600bps, 8 data bits, no parity, one stop bit, RTS and DTR High.
Select 2), the peripheral module responds asking for a port number:
Type the port number, press <cr> and the unit responds:
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 1), for the Handshaking menu, Default is None, the Host module responds with the following:
+----+------+-----------------+------+------+------+------+---------+----+----+
|Port|Device| Device | Baud | Word | Stop |Parity|Handshake|LineDrive|
| | Type | Name | Rate | Size | Bits | | |DTR |RTS |
+----+------+-----------------+------+------+------+------+---------+----+----+
| 1 | RS232| Device A | 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
Enter Serial Port Number (? = Help, ENTER = Exit) :1
+----+------+-----------------+------+------+------+------+---------+----+----+
|Port|Device| Device | Baud | Word | Stop |Parity|Handshake|LineDrive|
| | Type | Name | Rate | Size | Bits | | |DTR |RTS |
+----+------+-----------------+------+------+------+------+---------+----+----+
| 1 | RPC | Device A | 9600 | 8 | 1 | None | None | HI | HI |
+----+------+-----------------+------+------+------+------+---------+----+----+
| 2 | RS232| Device B | 9600 | 8 | 1 | None | None | HI | HI |
+----+------+-----------------+------+------+------+------+---------+----+----+
| 3 | RS232| Device C | 9600 | 8 | 1 | None | None | HI | HI |
+----+------+-----------------+------+------+------+------+---------+----+----+
| 4 | RS232| Device D | 9600 | 8 | 1 | None | None | HI | HI |
+----+------+-----------------+------+------+------+------+---------+----+----+
Strike ENTER to continue