Total Control MP/16, Operator'S Manual

Page: 116 / 182

C-2 Using AT Commands
Bit-Mapped Registers
Some registers are bit-mapped (bits 0
−
7). To turn on one or more
bits in any bit-mapped register, use the total of the values of the
bits you want to turn on. For example, to turn on bits 0, 2, and 5,
set the S-Register equal to 37 (S
r
=37). To turn on all the bits in a
register, set it with a value of 255 (S r =255).
Alternatively, you can turn on bits one at a time using the
following format: S
r . b =1, where r is the register and .b is the bit. 1
is ON and 0 is OFF. For example, to turn on bit 3 of Register 27,
send the following command:
ATS27.3=1
Sending Commands to the Modem
Setup
In order to use AT commands, you must first establish an EIA RS-
232 serial connection with the modem. Use the following steps:
1
Connect a PC to the modem EIA RS-232 port on the back of the
MP/16. Use an RJ45-to-DB-25 (or DB-9) serial cable.
2
Run a communications or terminal emulation program on the
PC. You may have to specify the proper COM port.
NOTE:
Most communications programs send an initialization
string to the modem when you load the program. You should
remove your software’s initialization string so it does not
interfer with the modem’s power-on defaults.
3
Use the communications program to establish a terminal
session, sometimes refered to as
terminal mode.
In terminal
mode, the program usually displays a blank screen. See your
communications software manual.