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CHAPTER 5: Operation
NOTE
The default setting for SW2 is positions 1–5 OFF and position 6 ON.
If you need to field configure a Modem 202T, you will need the following
information.
1. Baud rate of the serial device you are connecting with (unless using simplex).
2. Character format (1 start bit + # data bits + parity + 1 stop bit). This must add
to 10 or 11 bits.
Set SW2-3 ON = 11 bits, or OFF = 10 bits.
3. Use of RTS line from your equipment to control the flow of data into and
between modems. If RTS use is unknown, set the unit for DSCC DataSense
mode.
Set SW2-4 OFF = DSCC DataSense ON = RTS
4. Either 1 wire pair (2-wire mode) or 2 wire pairs (4-wire mode). Set SW3.
5. Half or full duplex data transmission method, bi-directional or one-way data
flow (simplex). Set SW2-5 and SW2-6 using the information in Table 4-2.
NOTE
After changing any switches, remove DC power and reapply to
memorize the changes. Switches are only read during power on.
5.2 Baud Rate Selection
The Modem 202T will operate at 300, 600, and 1200 baud in a 10- or 11-bit word
format. The modem is parity transparent; however, it must know if there are 8 or 9
bits of data/parity. In Simplex mode, the Modem is baud-rate and protocol
transparent and the baud switches are ignored. The Baud rate is set using switches
SW2-1 and SW2-2.
Table 5-1. Selecting the baud rate.
Baud Rate SW2-1 SW2-2
*1200 OFF OFF
600 ON OFF
300 ON ON
Not Used OFF ON
*Default
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