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3.0 CONFIGURATION
The Models 593/25F, 593/45, and 593/TB feature configuration via hard-
ware switches and headers. This section describes all possible hardware config-
urations, including the factory default settings. Table 1 below summarizes config-
uration of switches and headers for the Model l 593/25F, 593/45, and 593/TB.
3.1 DIP SWITCH S2 & S3
The Models 593/25F, 593/45, and 593/TB feature two eight-position Dip
switches (S2 and S3). These switches are accessed by opening the plastic
case by inserting a small flat blade screwdriver in the slot on either side of the
case and twisting gently. Figure 1A, below shows Models 593/TB & 593/45
bottom view of the printed circuit board and the location of the dip switches.
Figure 1B shows Model 593/45 bottom view of the printed circuit board and the
location of the DIP switches
The Models 593/25F, 593/45, and 593/TB switches (S2-1 thru S2-8 &
S3-1 thru S3-8) can be configured as either “On” or “Off”. Figure 2 shows the
orientation of the DIP switches with respect to ON/OFF positions.
3.1.1 Configuration DIP Switches Sets S2 and S3
The two eight-position Dip switches are used to configure the units for
common asynchronous data rates, full or half duplex over 2-wire/4-wire twisted
pair. The following sections describe all the possible configurations.
Figure 2. Close up of DIP switches showing ON/OFF positions.
The switch is shown in the Off position.
NOTE: When selecting any hardware configurations
below, Switch S2 and Switch S3 must be set the same.
S3
ON
OFF
S2
ON
OFF
Figure 1B. Model 593/25, location of S2 &
S3 on Printed Circuit Board
S2
ON
OFF
S3
ON
OFF
Figure 1A. Models 593/TB & 593/45, location
of S2 & S3 on Printed Circuit Board
Position Function ON/OFF Full Duplex Half Duplex Half Duplex
S2-1 TX Mode HD/FD OFF ON ON
S2-2 Operation 422/485 ON OFF OFF
S3-1 TX Mode HD/FD OFF ON ON
S3-2 Operation 422/485 ON OFF OFF
S1-1,2 Interface 2W/4W OFF ON OFF
S1-3 RX IMP. 120 /HI ON ON ON
S1-4 Not Used ( ) X X X
S4-1, 2 Interface 2W/4W OFF ON OFF
S4-3 RX IMP. 120 /HI ON ON ON
S4-4 Not Used ( ) X X X
Table 1. Configuration summary of swithes and headers
Switch Mode 422 4W 485 2W 485 4W
Ω
Ω
Typical Application Settings
3.1.2 Full/Half Duplex S2-1 and S3-1
Switches S2-1 and S3-1 determine full duplex or half duplex trans-
mission mode.
3.1.3 422/485 Operation S2-2 and S3-2
Switches S2-2 and S3-2 determine RS-422 or RS-485 interface
operation.
Half Duplex Full Duplex
S2-1 ON OFF
S3-1 ON OFF
RS-422 RS-485
S2-2 ON OFF
S3-2 ON OFF