Patton electronic 1004ABRC user manual Switch SET S2, Switch Settings Modem B, Switch SET S3

S1-3: Reserved

Switch S1-3 is reserved and must remain in the OFF position.

S1-3	Setting
On	Not a Valid Setting
Off	Default Setting

S1-4: Echo Mode

The setting for switch S1-4 determines whether the Model 1004ABRC echoes data back to the transmitting device (half-duplex mode only).

S1-4	Setting
On	Echo On
Off	Echo Off

SWITCH SET “S2”

DIP switch S2 is used to configure transmit impedance, and 2-wire/4-wire operations. The summary table below shows the factory default settings for switch S2. Following the summary table is a detailed description of each individual switch.

SWITCH S2 SUMMARY TABLE (factory defaults in bold)

Position	Function	ON Position	OFF Position
S2-1*	TX Impedance	Intermediate	High
S2-2*	TX Impedance	Intermediate	High
S2-3*	2-Wire/4-Wire	2-Wire	4-Wire
S2-4*	2-Wire/4-Wire	2-Wire	4-Wire

*Note: Switches S2-1 and S2-2 must be switched simultaneously. Switches S2-3 and S2-4 must be switched simultaneously.

S2-1 and S2-2: “Transmit Off” Impedance

Switches S2-1 and S2-2 are set together to determine whether the receiving device “sees” the impedance of the Model 1004ABRC’s trans- mitter as being “high” or “intermediate” when the transmitter is turned off. The “intermediate” setting is useful in half-duplex environments where the receiving device does not respond well to the “high” setting.

S2-1	S2-2	Setting
On	On	Intermediate Impedance
Off	Off	High Impedance

S2-3 and S2-4: 2-wire/4-wire Modes

Switches S2-3 and S2-4 are set together to determine whether the Model 1004ABRC is in 2-wire or 4-wire operating mode. Note: 2-wire mode is half-duplex only.

S1-2	S1-3	Setting
On	On	2-wire mode
Off	Off	4-wire mode

3.1.2 SWITCH SETTINGS - MODEM “B”

DIP switches S3 and S4 configure short range Modem B on the Model 1004ABRC front card. The tables below provide an overview of Modem A switch settings, including factory default settings. Following each figure is a detailed description of each switch’s function.

SWITCH SET “S3”

DIP switch S3 is used to configure receive impedance, RTS/CTS delay and “echo” enable/disable. The summary table below shows the factory default settings for switch S3.

Following the summary table is a detailed description of each individual switch.

SWITCH S3 SUMMARY TABLE (factory defaults in bold)

Position	Function	ON Position	OFF Position
S3-1	RX Impedance	120 Ohm	16K Ohm
S3-2	RTS/CTS Delay	8 msec	No Delay
S3-3	Reserved	-	Default Setting
S3-4	Echo Mode	Echo ON	Echo OFF

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