Contec COM-2DL-PCI, User Manual, Page: 21 / 62

2. Setup
14
COM-2PD(PCI)H, COM-4PD(PCI)H
Setting Transmission Mode
The data transfer mode setting switch is used to switch between full duplex and half duplex and to
specify whether to use RTS/CTS in full duplex mode. Set the appropriate data transfer mode for the
device with which you are communicating. SW3 sets the mode for channel 1, SW5 for channel 2, SW7
for channel 3, and SW9 for channel 4. Bits 1 - 5 are used to set the data transfer mode. Always set bit 6
is to OFF.
Setting Procedure
Table 2.1. Setting Transmission Mode
Transmission
mode
Setting
(SW1, SW5,
SW7, SW9)
Half duplex
When there are RTS and CTS
When there are no
RTS and CTS
To connect RTS and CTS to
the other unit,
communication is available.
TXD is only used for data
transmission; the sending
and receiving modes should
be switched over using
the modem control
register.
Full
duplex
RTS
CTS
RTS
CTS
With above setting, RTS and
CTS are connected in the
board.
Communication is available
without wiring of RTS and
CTS.
SW3, SW5, SW7, SW9 SW3, SW5, SW7, SW9 SW3, SW5, SW7, SW9
Factory
setting
ON
1
3
2 4
5
6
ON
1
3
2 4
5
6
ON
1
3
2 4
5
6
COM-2PD(PCI)H is only SW3 and SW5.
CAUTION
Do not use with bits 1 and 2 both set ON as this may result in damage to the board.