Db9 Connector - Sutron MONITOR Operation & Maintenance Manual

DB9 Connector

MONITOR comes with a DB9F connector for connection to RS-232 devices. The DB9F
can be connected to the serial port on most PCs using a straight cable. A null modem
adapter is needed to connect to most PDAs and modems. There is a
interface that allows communication via RS-232.
The following table shows the pin assignments in the DB9F connector.
DB9F Pin Name
1
2
3
4
5
6
7
8
9*
*Pin 9 can be used to provide 12V, 5V or no voltage. Certain devices, such as Bluetooth
dongles require power on that pin. Any setting will work for talking to a PC.
What voltage is output is controlled by an internal jumper. To setup the jumper, the case
must be opened. Once the case is open, the jumper is easily accessible. The Jumper in
question is J19, and is located next to the RS232 connector. Set the jumper across pins 1
and 2 to provide 12V, across pins 2 and 3 to provide 5V, or remove jumper to have no
voltage output.
Another jumper J16 (located near J19) determines when MONITOR outputs the voltage
on pin 9. If the jumper is across pins 1 and 2, MONITOR will always output the voltage
on pin 9. Any other configuration will cause MONITOR to output the voltage only when
it is using the RS232 port (such as when it's talking to a PC or a GPS).
Notes
N/C No Connection
RXD Data from MONITOR
TXD Data to MONITOR
DTR Signal to MONITOR
Ground
N/C No Connection
RTS Request to Send, signal to MONITOR
CTS Clear to Send, signal from MONITOR
Jumper selectable for 5V or VBAT
VOUT
(100ma max)
6
command line