RIO-15C Registers

Coils (0XXXX)

DO1		1
DO2		2
DO3		3
DO4		4

Discrete Inputs (1XXXX)

DI1		1
DI2		2
DI3		3
DI4		4

Input Registers (3XXXX)

Channel 1	0=0mA, 4095=20mA	1
Channel 2	0=0mA, 4095=20mA	2
Channel 3	0=0mA, 4095=20mA	3
Channel 4	0=0mA, 4095=20mA	4
Supply	4095=FS	5

Channel 1	0=4mA, 32767=20mA	11
Channel 2	0=4mA, 32767=20mA	12
Channel 3	0=4mA, 32767=20mA	13
Channel 4	0=4mA, 32767=20mA	14

Channel 1	0=0mA, 32767=20mA	21
Channel 2	0=0mA, 32767=20mA	22
Channel 3	0=0mA, 32767=20mA	23
Channel 4	0=0mA, 32767=20mA	24
Supply	32767=FS	25

Channel 1	0=4mA, 4095=20mA	31
Channel 2	0=4mA, 4095=20mA	32
Channel 3	0=4mA, 4095=20mA	33
Channel 4	0=4mA, 4095=20mA	34

Channel 1	raw, for cal. only	41
Channel 2	raw, for cal. only	42
Channel 3	raw, for cal. only	43
Channel 4	raw, for cal. only	44
Supply	raw, for cal. only	45

Holding Registers (4XXXX)

DI1Count		1
DI2Count		2
DI3Count		3
DI4Count		4

Debounce	in ms	11

BaudDiv	baud rate divisor	21
SerialMode	parity & stop bits	22
SerialTimeout	default=5	23
RespDelay	in ms	24
QuietTime	in ms	25

LEDControl	0=off, 1=on	31
MirrorMode	0=off, 1=slave, 2=master	32
CTSEnable	0=off, 1=on	33

MirRepeat	in s	41
MirTimeout	in s	42
MirFailSafe	bitmapped	43
MirDO1Addr	addr for DO1	44
MirDO2Addr	addr for DO2	45
MirDO3Addr	addr for DO3	46
MirDO4Addr	addr for DO4	47
MirDO1Port	port for DO1	48
MirDO2Port	port for DO2	49
MirDO3Port	port for DO3	50
MirDO4Port	port for DO4	51
MirDI1Addr	addr for DI1	52
MirDI2Addr	addr for DI2	53
MirDI3Addr	addr for DI3	54
MirDI4Addr	addr for DI4	55
MirDI1Port	port for DI1	56
MirDI2Port	port for DI1	57
MirDI3Port	port for DI1	58
MirDI4Port	port for DI1	59
MirAO1Addr	addr for AO1	60
MirAO2Addr	addr for AO2	61
MirAO1Port	port for AO1	62
MirAO2Port	port for AO2	63
MirAI1Addr	addr for AI1	64
MirAI2Addr	addr for AI2	65
MirAI3Addr	addr for AI3	66
MirAI4Addr	addr for AI4	67
MirAI1Port	port for AI1	68
MirAI2Port	port for AI1	69
MirAI3Port	port for AI1	70
MirAI4Port	port for AI1	71

DACOffset1	signed	81
DACOffset2	signed	82
ADCOffset1	signed	83
ADCOffset2	signed	84
ADCOffset3	signed	85
ADCOffset4	signed	86

DACScale1	4095=unscaled	91
DACScale2	4095=unscaled	92
ADCScale1	4095=unscaled	93
ADCScale2	4095=unscaled	94
ADCScale3	4095=unscaled	95
ADCScale4	4095=unscaled	96
ADCScale5	4095=unscaled	97

Pulse1	in ms	101
Pulse2	in ms	102
Pulse3	in ms	103
Pulse4	in ms	104

BCastReset	see below	141-143
Address		144

DI1LongCount		151-152
DI2LongCount		153-154
DI3LongCount		155-156
DI4LongCount		157-158

SerialNum		161-162
RadioSNum	radio serial number	163-164

LastCalTimestamp	Unix format	171-172
CalInitials		173-174
LastUpdateTimestamp	Unix format	175-176

Mirror Failsafe

Output failsafe levels are determined by the 16-bit value stored in holding register 43:

Bits	Binary Values	Failsafe effect
4, 0	00 10 11	DO0 - no change DO0 - OFF DO0 - ON
5, 1	00 10 11	DO1 - no change DO1 - OFF DO1 - ON
6, 2	00 10 11	DO2 - no change DO2 - OFF DO2 - ON
7, 3	00 10 11	DO3 - no change DO3 - OFF DO3 - ON
12, 8	00 10 11	AO0 - no change AO0 - LOW AO0 - HIGH
13, 9	00 10 11	AO1 - no change AO1 - LOW AO1 - HIGH

Broadcast Reset

The Modbus address of a RIO-15C device can be changed by broadcasting (i.e. sending to Modbus address 0) a write to holding registers 141-143.

The write should be done with a single, Write Multiple Registers command. In the first two registers (most signifigant word followed by least signifigant word), you should write the device's serial number. In the last register, you should write the new Modbus address.

As per the Modbus standard, the RIO device will not respond to this broadcast. Immediately after receipt, the RIO device will begin responding to requests made of the new address, however, this change will only be permanent if the DIP switches have all been set the same direction.