Advantech PCI-1612 Manuel d'utilisateur télécharger pdf (Page 30)

PCI/ PCI Express-Communication User Manual 20

Then decide which mode the Tx and Rx will operate in. The options are active or pas-

sive. In the active mode, the Tx or Rx will generate the current requirement for data

transfer over the link. In the passive mode, the current is generated by the card at the

other end of the link.

A and B are set to be active Rx, and E is set to be active Tx.

Figure 2.20 Active Mode Jumper Setting

C and D are set to be passive Rx, and F is set to be passive Tx.

Figure 2.21 Passive Mode Jumper Setting

You may configure both Tx and Rx on one port to operate in the same mode, or you

can configure each Tx and Rx on one port to operate in different modes.

If you set PCI-1603 to the current-loop mode, plug the card to your device and turn

on the device, both LEDs Rx1 and Rx2 on top corner of PCI-1603 board are lighten,

indicating that current-loop mode is enabled!

2.3.3.5 Enable mode selection

You set the Enable mode using two, four or eight position DIP switches, one for each

port. If the switches are set to "AUTO", the driver automatically senses the direction

of the data flow and switches the direction of transmission. No handshaking is neces-

sary.

If DIP switches are set to “On”, the driver is always enabled, and always in high or

low status. The user must select a mode before beginning RS- 422 applications.

Note! When either channel is configured in the RS-232 mode, the two associ-

ated Tx/Rx active/passive jumpers will be inoperable.

Table 2.2: Enable Mode Selection

Mode Switch Position

RS-485 AUTO

RS-422_Master ON

MS-422_Slave AUTO

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 77 78

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Advantech PCI-1612 Manuel d'utilisateur Page 30