ICOM-2S Manual
3-2
Manual MICOM-2S.Eb
Simplex or Duplex
The receiver can be set in either Simplex or Duplex by installing jumpers marked SX or DX. Simplex
mode is intended for one-way communication able to transmit or receive. Duplex mode allows
transmission or reception either simultaneous or alternatively as defined in the following paragraph.
Full or Half-Duplex
Full-Duplex allows simultaneous bi-directional communications and is selected by installing the FDX
jumper. Half-Duplex allows bi-directional transmit and receiver communication but only one at a
time, and is required for RS485 communications. Proper selection depends on the wire connections
used to connect the two serial ports. Tx is the transmit wires and Rx is the receive wires.
Communication Modes and Cabling Options
Cable
Mode
Jumpers
Card A Card B
Simplex
2-wire Receive Only
DX-FDX
Rx-
1 . . . . . . . . . . . 3
Rx+
9 . . . . . . . . . . . 2
Simplex
2-wire Transmit Only
SX-FDX
Tx+
2 . . . . . . . . . . . 9
Tx-
3 . . . . . . . . . . . 1
Half-Duplex
2-wire with local echo
DX-HDX-RTS Trx+
9 . . . . . . . . . . . 9
Trx-
1 . . . . . . . . . . . 1
Half-Duplex
2-wire w/o local echo
SX-HDX-RTS Trx+
9 . . . . . . . . . . . 9
Trx-
1 . . . . . . . . . . . 1
Full-Duplex
4-wire w/o local echo
DX-FDX
Tx+
2 . . . . . . . . . . . 9
Tx-
3 . . . . . . . . . . . 1
Rx-
1 . . . . . . . . . . . 3
Rx+
9 . . . . . . . . . . . 2
Interrupts
In addition to standard interrupt levels IRQ2 through IRQ7, the ICOM-2S also supports higher
interrupts IRQ10 through IRQ15 (Except for IRQ13). Select the desired level by installing a jumper
in one of these locations. If the ICOM-2S is installed in a short eight-bit slot, the higher interrupts
IRQ10 through IRQ15 will be unavailable to the card.
Summary of Contents for ICOM-2S
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