ecification
3.4.4 RS485 SIO
Two modes are available: the Modbus gateway mode in which the unit operates as a Modbus/RTU slave station, and the SIO
through mode in which the unit operates by means of serial communication per the Modbus/RTU and ASCII protocols.
Specification
Item
Modbus gateway mode SIO through mode
Power supply
24 VDC ± 10%
Current consumption 600 mA max.
Communication format 1:1 communication connection
conforming to RS485
1:N (1≤ N ≤ 16) communication
connection conforming to RS485
Communication method Asynchronous half-duplex
Communication mode Modbus/RTU Modbus/RTU, ASCII
Baud rate [bps] *2
9600
19200 38400 57600 115200 230400
38400 57600 115200 230400
Frame delay time t3.5 Fixed to 1.75 ms t3.5 Fixed to 1.75 ms
Slave address Fixed to 63 (3FH) Axis number + 1 (01H to 10H)
Master ⇒
ROBONET
F600H to F647H
Register address
ROBONET ⇒
Master
F700H to F747H
Arbitrary
Available function codes
Read Holding Register (03H)
Preset Single Register (06H)
Preset Multiple Register (10H)
01H to 07H
0FH, 10H, 11H, 17H
Maximum send/receive buffer size 160 byte
Bit length 8 bits
Start bit 1 bit
Stop bit 1 bit
Parity None
Host RS485 specifications
Cable length
100 m max. (master ⇐⇒ RGW-SIO)
Transmission path configuration IAI’s dedicated multi-drop differential communication
Communication method Half-duplex
Synchronization method Start-stop method
Transmission path format Conforming to EIA RS485, 2-wire type
Baud rate 230.4 k [bps]
Error control method No parity bit, CRC *2
Communication cable ROBONET communication connection circuit board (supplied), ROBONET
extension cable (when an extension unit is used)
SIO communication
specifications
Number of units that can be connected 16 axes max.
Surrounding air temperature
0 to 40°C
Surrounding humidity 95% RH max. (non-condensing)
Surrounding environment Free from corrosive gases, flammable gases, oil mist or powder dust.
Storage temperature
-25 to 70°C
Storage humidity 95% RH max. (non-condensing)
Vibration resistance XYZ directions:
10 to 57 Hz, half amplitude – 0.035 mm (continuous) / 0.075 mm
(intermittent)
57 to 150 Hz – 4.9 m/s
2
(continuous) / 9.8 m/s
2
(intermittent)
Impact resistance XYZ directions:
147 mm/s
2
, 11 ms, half-sine wave pulse
Protection degree IP20
Weight Approx. 140 g
Environment conditions
External dimensions [mm] 34 W x 105 H x 73.3 D [mm]
*1: The baud rate is set by the gateway parameter selection tool.
*2: If the host is a PLC, the PLC must have a RS485 or RS232C interface. If a RS232C interface is used, a SIO converter
(RCB-TU-SIO-*) is required.
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