Patton electronics 1004ARC, User Manual

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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 1004ARC “sees” RTS and when it sends
CTS. Note: RTS/CTS Delay setting should be based upon transmis-
sion timing.
S3-2 Setting
On 8 msec
Off no delay
S3-3: Carrier Delay
The setting for switch S3-3 determines whether the carrier is
“Constantly On” or “Controlled by RTS”. This setting allows for opera-
tion in switched carrier, multipoint and/or hardware handshaking appli-
cations.
S3-3 Setting
On Controlled by RTS
Off Constantly ON
S3-4: Echo Mode
The setting for switch S3-4 determines whether the Model
1004ARC 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 1004ARC’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 1004ARC 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 OFF Impedance Intermediate High
S4-2* TX OFF 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.