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Make delay depend on number of bits per character #112

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Make delay depend on number of bits per character #112

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94a00b2
Make delay depend on number of bits per character
freemp Mar 22, 2023
aed35cb
Update api.md
kidpixo May 11, 2023
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2 changes: 1 addition & 1 deletion docs/api.md
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Expand Up @@ -229,7 +229,7 @@ int requestFrom(int id, int type, int address,int nb);

#### Parameters
- id (slave) - id of target, defaults to 0x00 if not specified
type - type of read to perform, either COILS, DISCRETE_INPUTS, HOLDING_REGISTERS, or INPUT_REGISTERS
- type - type of read to perform, either COILS, DISCRETE_INPUTS, HOLDING_REGISTERS, or INPUT_REGISTERS
- address start address to use for operation
- nb - number of values to read

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6 changes: 3 additions & 3 deletions examples/RTU/ModbusRTUClientParameters/ModbusRTUClientParameters.ino
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Expand Up @@ -22,9 +22,9 @@ constexpr auto baudrate { 19200 };
// Paragraph 2.5.1.1 MODBUS Message RTU Framing
// https://modbus.org/docs/Modbus_over_serial_line_V1_02.pdf
constexpr auto bitduration { 1.f / baudrate };
constexpr auto wordlen { 9.6f }; // try also with 10.0f
constexpr auto preDelayBR { bitduration * wordlen * 3.5f * 1e6 };
constexpr auto postDelayBR { bitduration * wordlen * 3.5f * 1e6 };
constexpr auto charlen { 11.0f };
constexpr auto preDelayBR { bitduration * charlen * 3.5f * 1e6 };
constexpr auto postDelayBR { bitduration * charlen * 3.5f * 1e6 };

void setup() {
Serial.begin(9600);
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