18
TOTE-A-FAX 542
REGISTER
NUMBER
REGISTER FUNCTION
S16
Test Register (
continued
)
Bit 4
Initiate Remote Test
Bit 5
Initiate Remote Test with Self Test
Bit 6
Analog Loopback with Self Test
Bit 7
Reserved
S17
Reserved
S18
Test time stored in nonvolatile RAM (XL93C46);
default = 000
(seconds)
S19
Reserved
S20
Reserved
S21
Bit mapped register: stored in nonvolatile ROM (XL93C46)
READ ONLY MEMORY
Bit 0
0 = RJ11 Jack
Bit 1
Reserved
Bit 2
CTS/RTS Function
Bit 3
DTR Function
Bit 4
DTR Function
Bit 4
Bit 3
Function
0
0
DTR always true —
defaul
t
0
1
DTR Off, forces command state
1
0
DTR Off, forces modem offline
1
1
Modem initializes with DTR Off (ATZ)
Bit 5
EIA carrier status
Bit 6
Guard tone select
Bit 7
Guard tone select
Bit 7
Bit 6
Function
0
0
No guard tone —
default
0
1
550 Hz guard tone
1
0
1800 Hz guard tone
1
1
Reserved