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22 Operating Manual for RS-232 for XPD Series Power Supply
Table 2.6 Jumper/Pin Settings for DTR/DSR Flow Control (Default)
Connections Use a 9-pin (DB9) to 9-pin parallel cable to connect the interface card to the
serial port on the host computer. If you need to use a 25-pin connector (DB25)
on the host interface, ensure the correct connections are made by referring
Table 2.7. If the proper cables are not available and you need to change the
transmit/receive pin configuration, see “Transmit / Receive Pin Selection”.
Table 2.7 Transmit/Receive Pin Connections
Transmit /
Receive Pin
Selection
The RS-232 interface can use either pin 2 or pin 3 of the RS-232 connector to
transmit or receive data. You can set the pin orientation you want by changing
the position of the J10 jumper on the interface PCB. Table 2.8, “Jumper Settings
for Transmit/Receive Pin Selection” shows the transmit/receive pin selection on
the RS-232 connector in relation to the settings of the J10 jumper. See
Figure 2.3, “RS-232 Interface PCB” on page 18 to locate jumper J10.
Table 2.8 Jumper Settings for Transmit/Receive Pin Selection
Jumper Connections RS-232 Connector Pin
DTR (Input to RS-232)
J17 to 2-4 and 1-3
4
DSR (Output to RS-232)
J16 to 3-5 and 4-6
6
Power Supply (DCE) Host Computer (DTE)
9-pin connector
Pin 2 transmits to Pin 2 (Receive)
Pin 3 receives from Pin 3 (Transmit)
Pin 5 (Ground) connects to Pin 5 (Ground)
25-pin connector
Pin 2 transmits to Pin 3 (Receive)
Pin 3 receives from Pin 2 (Transmit)
Pin 5 (Ground) connects to Pin 7 (Ground)
Jumper J10 Connections RS-232 Connector Pin
Transmit (TXD)
4-6 (default)
4-2
3
2
Receive (RXD)
3-1 (default)
3-5
2
3