RIO-9H Registers

Coils (0XXXX)

DO1		1
DO2		2
DO3		3

Discrete Inputs (1XXXX)

DI1		1
DI2		2
DI3		3
AI1		4
AI2		5
AI3		6
AI4		7

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
AI1Count		4
AI2Count		5
AI3Count		6
AI4Count		7

Debounce	in ms	11

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

LEDControl	0=off, 1=on	31
CTSEnable	0=off, 1=on	32

ADCOffset1	signed	41
ADCOffset2	signed	42
ADCOffset3	signed	43
ADCOffset4	signed	44

ADCScale1	4095=unscaled	51
ADCScale2	4095=unscaled	52
ADCScale3	4095=unscaled	53
ADCScale4	4095=unscaled	54
ADCScale5	4095=unscaled	55

Pulse1	in ms	61
Pulse2	in ms	62
Pulse3	in ms	63

BCastReset	see below	71-73
Address		74

DI1LongCount	deprecated	81-82
DI2LongCount	deprecated	83-84
DI3LongCount	deprecated	85-86

SerialNum		91-92
RadioSNum	radio serial number	93-94

LastCalTimestamp	Unix format	101-102
CalInitials		103-104
LastUpdateTimestamp	Unix format	105-106

DI1LongCount		111-112
DI2LongCount		113-114
DI3LongCount		115-116
AI1LongCount		117-118
AI2LongCount		119-120
AI3LongCount		121-122
AI4LongCount		123-124

Broadcast Reset

The Modbus address of a RIO-9H device can be changed by broadcasting (i.e. sending to Modbus address 0) a write to holding registers 71-73.

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.