© Microhard Systems Inc. Confidential 83
6.0 Register/Command Reference
6.2 Settings (S) Registers
The majority of modem configuration is done via the Settings (S) Registers.
Section 4.0 provides configuration detail related to operating modes and network topologies; this section
examines each S register in detail for reference or advanced/custom networks. Appendix C is a quick
reference for the S register options.
In the following descriptions, default settings (where applicable) are in boldface. In Command Mode,
Query format: ATS<S register #>? [Enter]
Change format : ATS<S register #>=<value> [Enter]
Help format: ATS<S register #><space>/? [Enter]
Values
S0 Power-up Mode
0 - In command mode
1 - In data mode (default)
Can be used to select the mode in which the unit powers up. May be useful for
users who need to configure that modem at each power up. When used with
the login password, can prevent the unauthorized use of the modem.
Values (0-255)
S2 Escape Character
43 (+)
0 disables escape detection
Escape character (0-255) that is used in escape detection to put the modem
offline. Entered as a decimal number, the default of which is 43 which is the
value for the ‘+’ ASCII character. Setting to zero disables escape detection.
Note: It must be set to the default to use the Microhard AT Command Firmware
Upgrade Utility.
Values (0-3)
S80 (MESH) Transmit Profiles
0
In Mesh, coordinators use automatic ranking (if enabled by S220) to logically
separate networks, ensuring that the shortest path to the Primary Coordinator is
achieved. Also to ensure that modems do not erratically associate to multiple
coordinators. Once ranked, TX Profiling can be used to split the bandwidth to
allow differently ranked units opportunity to send data during assigned frames.
Refer to TX Profiling & Ranking in Section 3.
Profiles:
0: 0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF,0xF
1: 0x1,0x2,0x1,0x2,0x1,0x2,0x1,0x2,0x1,0x2,0x1,0x2,0x1,0x2,0x1,0x2
2: 0x1,0x2,0x2,0x2,0x2,0x2,0x2,0x2,0x2,0x4,0x4,0x4,0x4,0x8,0x8,0x8
3: 0x1,0x2,0x2,0x2,0x2,0x2,0x2,0x2,0x1,0x2,0x2,0x2,0x2,0x2,0x2,0x2
Values (0 to –255 dBm)
S81 (MESH) CS Threshold
60
The P900 uses CSMA (Carrier Sense Multiple Access) to determine if the
channel is available. The Carrier Detect Threshold is used to set the measured
level in which the signal is deemed as a valid carrier signal or outside noise or
interference (noise floor). The value represented by S81 is in –dBm. A value of
Zero (0) disabled CSMA. See Section 3 for more information.
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