Patton electronic 1004ABRC Front Card Configuration, Switch Settings - Modem “A”, SWITCH SET “S1”

3.0 CONFIGURATION

This section describes the location and orientation of the Model 1004ABRC's configuration switches, provides detailed instructions on setting each switch and describes the settings for each of the rear con- nection cards.

3.1 FRONT CARD CONFIGURATION

The Model 1004ABRC front card houses two short hauls–Modem A and Modem B– each using two sets of DIP switches. The locations of these switches are shown in Figure 1 (below). These switches are accessible when the card is slid out of the rack chassis. Once config- ured, the Model 1004ABRC is designed to operate transparently, with- out need for frequent re-configuration.

S2

S1

S4

S3

Figure 1. Model 1004ABRC Card, showing location of configuration switches.

Each of the DIP switches on the Model 1004ABRC function card is a 4-position switch. Figure 2 (below) shows the On/Off orientation of these switches. Use a small screw driver or similar instrument to set each individual switch.

ON

ON

OFF 1 2 3 4

Figure 2. Close-up of DIP switches, showing ON/OFF orientation.

3.1.1 SWITCH SETTINGS - MODEM “A”

DIP switches S1 and S2 configure short range Modem A on the Model 1004ABRC front card. The tables below provide an overview of Modem A switch settings, including factory default settings. Following the tables is a descriptions of each switch’s function.

SWITCH SET “S1”

DIP switch S1 is used to configure receive impedance, RTS/CTS delay, carrier control operation and “echo” enable/disable. The summary table below shows the factory default settings for switch S1. Following the summary table is a detailed description of each indi- vidual switch.

SWITCH S1 SUMMARY TABLE (factory defaults in bold)

Position	Function	ON Position	OFF Position
S1-1	RX Impedance	120 Ohm	16K Ohm
S1-2	RTS/CTS Delay	8 msec	No Delay
S1-3	Reserved	-	Default Setting
S1-4	Echo Mode	Echo ON	Echo OFF

S1-1: Receive Impedance

The setting for switch S1-1 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.

S1-1	Setting
On	Low (120 Ohm)
Off	High (16K Ohm typical)

S1-2: RTS/CTS Delay

The setting for switch S1-2 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.

S1-2	Setting
On	8 msec
Off	no delay

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