Silicon Laboratories SI2493/57/34/15/04 - Manual (Page 236)

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236 Rev. 1.3
9.2.1. SMS User Registers
User registers that set up SMS operations are shown in Table 147. The default settings are shown in bold.
Table 147. User Registers for SMS Operations
Register Bits Name Description Default
(Hex)
U70 15 HES Enables ESC (pin 22)
0 = Disabled
1 = Enabled 0
UAA 2 RUDE 0 = Disables rude disconnect
1 = Enables rude disconnect 0
UCA 0 SMSMOD Modulation for SMS data
0: Bell202
1: V.23 0
UCB 15:0 TXCS Number of channel seizure bits
0 = no Channel Seizure
1 to 65535 = number of continuous alternating
spaces and marks in Channel Seizure. 2580
UCC 7:0 TXMK Number of mark bits in message header 2580
UCD 0 CASRPT Respond to CAS, don’t report to the host (Auto) or do
report to the host (Manual)
0 = Auto Mode
1 = Manual Mode 0
UD1 11:0 TXDEL Time the Originate modem waits before transmitting a
frame, in 10 ms units. Timed from the termination of the
previous signal. 0000
UD2 11:0 RXTO Time that the Answer modem waits for the received sig-
nal after it receives the +FRM command; in 10 ms units 0000
UD3 15:0 V.29FC Answer Tone Detector Threshold (in ms).
Range = 50–180 ms 0000
UD4 14:0 CTDT CAS Tone Detector Threshold 0000
UD7 15:0 SMS Mark Length Threshold 0578