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ELM325SM Datasheet(PDF) 10 Page - ELM Electronics |
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ELM325SM Datasheet(HTML) 10 Page - ELM Electronics |
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10 / 31 page  10 of 31 ELM325 ELM325DSA Elm Electronics – Circuits for the Hobbyist www.elmelectronics.com AT R0), the ELM325 will not wait for a reply from the vehicle after sending a request – it will simply say ‘OK’, and will then return immediately to wait for the next command. An R0 setting will always override any ‘number of responses digit’ that is provided with a message. R0 may be useful for sending commands blindly when simulating an ECU for demonstration or test purposes. The default setting is R1, or responses on. RE0 and RE1 [ RE output to 0* or 1 ] This command is used to control the state of the RE output pin. After a powerup or reset, the ELM325 always sets this pin to a low level. If you send AT RE1, you will change the output to a high level (ie to VDD), and AT RE0 will restore it to a low level (VSS). While this pin was intended for use with RS485 transceiver ‘receive enable’ inputs, it does not need to be used in that way. This control pin functions independently of any internal circuitry so can be used for many other functions, such as disabling peripherals or blinking an LED. S0 and S1 [ printing of Spaces off or on* ] This command controls whether or not space characters are inserted in the message response. The ELM325 normally formats message responses as a series of two nibbles followed by a space (0x20) character. If you wish to reduce the amount of received data and your PC’s processing time, you may wish to turn spaces off. By default, spaces are on (S1), and space characters are inserted in every response. SM hh [ Set the MID to hh ] The ELM325 normally assumes that you wish to send using the MID ‘AC’ (which is decimal 172). This value has been assigned by SAE J1587 to the #1 Off- board Diagnostics unit. If you wish to change the MID that the ELM325 uses when sending messages, simply define it with this command. See the ‘Setting the MID’ section for more information. SP h [ Set the Priority to h ] Each message that is sent by the ELM325 has a priority assigned to it. These priorities can have values from 1 (the highest) to 8 (the lowest). The AT SP command may be used to change the message priority, but great care must be used with this. It is possible to preempt other more important messages if you change the priority, possibly adversely affecting the operation of the vehicle. Do not adjust this parameter if you are unsure of why you are doing so, and what affect it may have. By default, the ELM325 uses a priority value of 8. ST hh [ Set Timeout to hh ] After sending a request, the ELM325 waits a preset time for a response before it can declare that there was ‘NO DATA’ received from the vehicle. The same timer setting is also used after a response has been received, while waiting to see if any more are coming. The AT ST command allows this timer to be adjusted, in increments of 100 msec. The ST timer is set to 0F (15 decimal) by default, which gives a time of 1.5 seconds. Note that sending AT ST 00 does not result in no time – it causes the default time to be set. TC [ monitor for Trouble Code messages ] This command is used to quickly monitor for trouble codes that are being broadcast – that is, all PIDs that are equal to C2 (or decimal 194), without having to set the filters. The AT TC command uses the AT ST timer to limit the time that it waits for a message to arrive. WS [ Warm Start ] This command causes the ELM325 to perform a complete reset which is very similar to the AT Z command, but does not include the power on LED test. Users may find this a convenient way to quickly ‘start over’ without having the extra delay of the AT Z command. Z [ reset all ] This command causes the chip to perform a complete reset as if power were cycled off and then on again. All settings are returned to their default values, and the chip will be put into the idle state, waiting for characters on the RS232 bus. AT Command Descriptions (continued) |
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