2. Setup
COM-1(PM), COM-1D(PM)
15
COM-1D(PM) data transmission mode setting
Bits 1 to 5 of SW1 set the transmission mode. The settings are shown in the table below.
Table 2.1. COM-1D(PM) Data Transmission Mode Setting
Data
transmission
mode
Setting
procedure
(SW1)
Half duplex
[Half]
Connect RTS and CTS to
external device
Loopback RTS and CTS
Connect to the RTS and CTS
signals from the external
device.
This sets TxD as the only
data line and uses the RTS
signal on the PC card to
switch between send and
receive.
Full duplex
[Full]
RTS
CTS
RTS
CTS
If the device you are
communicating with does
not use the RTS and CTS
signals, you can use this
setting to make CTS active
when the RTS signal on the
PC card is set to active.
SW1
SW1
SW1
O
N
1
2
3
4
5
6
7
8
O
N
1
2
3
4
5
6
7
8
O
N
1
2
3
4
5
6
7
8
CAUTION
Do not set both bit 1 and bit 2 of SW1 ON at the same time as this may damage the PC card.
COM-1D(PM) terminating resistor setting
Bits 6 and 7 of SW1 specify whether or not to insert a terminator. The settings are shown in the table
below.
Table 2.2. COM-1D(PM) Terminating Resistor Settings
Connection on board
Insertion of Terminator
Figure 2.7 A or D
(either end of signal line)
Setting procedure
Inserted
Not Inserted
Figure 2.7 B or C
(other than end of signal line)
O
N
1
2
3
4
5
6
7
8
O
N
1
2
3
4
5
6
7
8
CAUTION
Always set bit 8 of SW1 to OFF.
