Sierra Wireless DART 300 manual Packet Assembly and Forwarding Options, Escape Options

User’s Guide UDP/TCP Service

8.For Client operation:

a.For UDP, optionally set the modem to wait for registration before opening a client session by setting +WS179=1. The default issues the CONNECT regardless of registration status.

b.Optionally enter a “quick-dial” directory by configuring Friends List entries.

c.Optionally enable Auto-dial on Start-up by configuring a Friends List entry and setting +WS216=1. If this is used, 8a. should leave the default setting of +WS179=0.

d.Optionally disable the server altogether by setting +WS212=0. It is enabled by default.

e.Optionally disable auto-answer using S0=0 (the default is enabled).

9.Optionally set an inactivity timer, to close an inactive session, using register S30. For dumb servers operating in UDP mode, this is highly recommended. For clients using the Auto-dial on Start-up feature, this should be set to 0 to keep the session open at all times.

8.2.4.Packet Assembly and Forwarding Options

Configure the packet assembler to suit the telemetry data.

10.+WS62=0 to disable the local echo of the packet assembler. Telemetry devices do not normally need local echo. The default is enabled.

11.+WS72=0 to disable packet buffer editing. If the telemetry data is binary the backspace character may otherwise be misinterpreted causing data loss.

12.Configure the PAD forwarding options.

a.If the telemetry data lends itself to forwarding on a primary character (such as <CR>, <LF>, or some other delimiter) then set the character in register +WS64. If the character is not considered part of the data stream then remove it from the packet using +WS63=1. If the data does not have a suitable forwarding character (most binary telemetry) then disable the option using +WS63=0.

b.Set the inter-character timer to a suitable duration for breaks in the data stream using +WS70=n where n is the duration in tenths of a second. This option is recommended for most telemetry applications and is required if the transmitted data is binary (non- ASCII).

c.Use register +WS74 to set the maximum packet length to a value suitable to the data blocks and the quality of the airlink connection (see Section 6.6.2 above for discussion). The default is the maximum of 1000 bytes.

8.2.5.Escape Options

Configure, or disable, the mechanism used to escape from data state to command state.

13.&Dn where n is the desired option to set use of DTR for escape and session control. The default is &D2 which escapes and closes the session.

14.S12=n where n is the guard time (in 0.02s units) to use for the standard time dependent escape sequence (TDES). The default is no guard time (0). If TDES is not needed, then disable it using S2=128.

15.Optionally disable the time independent (TIES) escape using +WS60=0 (the default is enabled). For binary data applications this should be disabled.

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