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Patton electronic 1004ABRC User Manual

Page 6

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S3-1: Receive Impedance

The setting for switch S3-1 selects the impedance of the input

receiver. You may select either a “low” impedance of 120 Ohms or a
“high” impedance of 16K Ohms. By selecting the proper impedance for
each drop, there may be up to 50 receivers in one application.

S3-1

Setting

On

Low (120 Ohm)

Off

High (16K Ohm typical)

S3-2: RTS/CTS Delay

The setting for switch S3-2 determines the amount of delay

between the time the Model 1004ABRC “sees” RTS and when it turns
on CTS. Note: RTS/CTS Delay setting should be based upon trans-
mission timing.

S3-2

Setting

On

8 msec

Off

no delay

S3-3: Reserved

Switch S3-3 is reserved and must remain in the OFF position.

S3-3

Setting

On

Not a Valid Setting

Off

Default Setting

S3-4: Echo Mode

The setting for switch S3-4 determines whether the Model

1004ABRC echoes data back to the transmitting device (half-duplex
mode only).

S3-4

Setting

On

Echo On

Off

Echo Off

SWITCH SET “S4”

DIP switch S4 is used to configure transmit impedance, and

2-wire/4-wire operations. The summary table below shows the factory
default settings for switch S4. Following the summary table is a
detailed description of each individual switch.

S4-1 and S4-2: “Transmit Off” Impedance

Switches S4-1 and S4-2 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.

S4-1

S4-2

Setting

On

On

Intermediate Impedance

Off

Off

High Impedance

S4-3 and S4-4: 2-wire/4-wire Modes

Switches S4-3 and S4-4 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.

S4-2

S4-3

Setting

On

On

2-wire mode

Off

Off

4-wire mode

SWITCH S4 SUMMARY TABLE (factory defaults in bold)

Position

Function

ON Position

OFF Position

S4-1*

TX Impedance

Intermediate

High

S4-2*

TX Impedance

Intermediate

High

S4-3*

2-Wire/4-Wire

2-Wire

4-Wire

S4-4*

2-Wire/4-Wire

2-Wire

4-Wire

*Note:

Switches S4-1 and S4-2 must be switched simultaneously.

Switches S4-3 and S4-4 must be switched simultaneously.