5: BASIC Stamp Command Reference – SERIN
BASIC Stamp Programming Manual 2.0c • www.parallaxinc.com • Page 277
shows how Baudmode is calculated and Tables 5.73, 5.74 and 5.75 show
common baud modes for standard serial baud rates.
Step 1: Determine the
bit period
(bits 0 – 11)
BS2 and BS2e: = INT(1,000,000 / baud rate) – 20
BS2sx: = INT(2,500,000 / baud rate) – 20
BS2p: = INT(2,500,000 / baud rate) – 20
Note: INT means 'convert to integer;' drop the numbers to the right of the
decimal point.
Step 2: Set data bits
and parity (bit 13)
8-bit/no-parity = 0
7-bit/even-parity = 8192
Step 3: Select
polarity (bit 14)
True (noninverted) = 0
Inverted = 16384
Baud
Rate
8-bit
no-parity
inverted
8-bit
no-parity
true
7-bit
even-parity
inverted
7-bit
even-parity
true
300 19697 3313 27889 11505
600 18030 1646 26222 9838
1200 17197 813 25389 9005
2400 16780 396 24972 8588
4800* 16572 188 24764 8380
9600* 16468 84 24660 8276
*The BASIC Stamp 2 and BASIC Stamp 2e may have trouble synchronizing with the
incoming serial stream at this rate and higher due to the lack of a hardware input buffer. Use
only simple variables and no formatters to try to solve this problem.
Baud
Rate
8-bit
no-parity
inverted
8-bit
no-parity
true
7-bit
even-parity
inverted
7-bit
even-parity
true
1200 18447 2063 26639 10255
2400 17405 1021 25597 9213
4800 16884 500 25076 8692
9600* 16624 240 24816 8432
*The BASIC Stamp 2sx may have trouble synchronizing with the incoming serial stream at
this rate and higher due to the lack of a hardware input buffer. Use only simple variables and
no formatters to try to solve this problem.
Baud
Rate
8-bit
no-parity
inverted
8-bit
no-parity
true
7-bit
even-parity
inverted
7-bit
even-parity
true
1200 18447 2063 26639 10255
2400 17405 1021 25597 9213
4800 16884 500 25076 8692
9600* 16624 240 24816 8432
*The BASIC Stamp 2p may have trouble synchronizing with the incoming serial stream at this
rate and higher due to the lack of a hardware input buffer. Use only simple variables and no
formatters to try to solve this problem.
Table 5.72: BS2, BS2e, BS2sx and
BS2p Baudmode calculation. Add
the results of steps 1, 2 and 3 to
determine the proper value for the
Baudmode argument.
Table 5.73: BS2 and BS2e
common baud rates and
corresponding Baudmodes.
Table 5.74: BS2sx common baud
rates and corresponding
Baudmodes.
Table 5.75: BS2p common baud
rates and corresponding
Baudmodes.
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