Setting Transmission Mode - Contec COM-2PD(PCI)H User Manual

2. Setup

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
Half duplex
mode
Setting
(SW1, SW5,
SW7, SW9)
SW3, SW5, SW7, SW9
TXD is only used for data
transmission; the sending
and receiving modes should
be switched over using
the modem control
register.
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.
14
duplex
When there are no
RTS and CTS
RTS
CTS
SW3, SW5, SW7, SW9
With above setting, RTS and
CTS are connected in the
board.
Communication is available
without wiring of RTS and
CTS.
Full
When there are RTS and CTS
RTS
CTS
Factory
setting
SW3, SW5, SW7, SW9
To connect RTS and CTS to
the other unit,
communication is available.
COM-2PD(PCI)H, COM-4PD(PCI)H