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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. SW2 sets the mode for channel 1, SW3 for channel 2.
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
ON
method
1
2
SW2, SW3
TXD is only used for data
transmission; the sending
and receiving modes should
be switched over using
the modem control
register.
CAUTION
Do not use with bits 1 and 2 both set ON as this may result in damage to the board.
12
When there are no RTS and
Half duplex
CTS
MODE
TERM
3
4
5
6
7
8
9 10
Full duplex
RTS
CTS
MODE
TERM
ON
1
2
3
4
5
6
7
8
9 10
SW2, SW3
With above setting, RTS
and CTS are connected in
the board.
Communication is available
without wiring of RTS and
CTS.
When there are RTS and
CTS
RTS
CTS
MODE
TERM
ON
1
2
3
4
5
6
7
8
9 10
SW2, SW3
Factory setting
To connect RTS and CTS to
the other unit,
communication is available.
COM-2PD-LPE
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