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Add function codes for Modbus communication with ebmpapst ventilators #598

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Add function codes for Modbus communication with ebmpapst ventilators #598

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8 changes: 8 additions & 0 deletions src/modbus.c
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Original file line number Diff line number Diff line change
Expand Up @@ -280,6 +280,12 @@ static uint8_t compute_meta_length_after_function(int function,
case MODBUS_FC_MASK_WRITE_REGISTER:
length = 6;
break;
case MODBUS_FC_READ_HOLDING_REGISTERS_SNR:
length = 7;
break;
case MODBUS_FC_WRITE_SINGLE_REGISTER_SNR:
length = 10;
break;
default:
length = 1;
}
Expand Down Expand Up @@ -313,6 +319,8 @@ static int compute_data_length_after_meta(modbus_t *ctx, uint8_t *msg,
function == MODBUS_FC_REPORT_SLAVE_ID ||
function == MODBUS_FC_WRITE_AND_READ_REGISTERS) {
length = msg[ctx->backend->header_length + 1];
} else if (function == MODBUS_FC_READ_HOLDING_REGISTERS_SNR){
length = msg[ctx->backend->header_length + 7];
} else {
length = 0;
}
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2 changes: 2 additions & 0 deletions src/modbus.h
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Original file line number Diff line number Diff line change
Expand Up @@ -70,6 +70,8 @@ MODBUS_BEGIN_DECLS
#define MODBUS_FC_REPORT_SLAVE_ID 0x11
#define MODBUS_FC_MASK_WRITE_REGISTER 0x16
#define MODBUS_FC_WRITE_AND_READ_REGISTERS 0x17
#define MODBUS_FC_READ_HOLDING_REGISTERS_SNR 0x43
#define MODBUS_FC_WRITE_SINGLE_REGISTER_SNR 0x46

#define MODBUS_BROADCAST_ADDRESS 0

Expand Down