Chapter One Introduction
man_905-105_2.16 Page 9
licensed radio channels in most countries.
• 105S-1, 105S-2, 105S-3 and 105S-4 modules have only serial communications. All other
specifications are as per the 905U-1, 2, 3 & 4 modules. The 105S modules are compatible with
905U modules. 105S modules may be used for serial I/O applications, or as I/O expansion for
905U modules.
• The 905U-C and 905U-G modules provides an interface between host devices such as PLC’s or
SCADA computers, and a wireless I/O system comprising 905U modules. The 905U-C and 905U-
G allows 905U modules to act as remote wireless I/O for the host devices. For more information,
refer to the 905U-C or 905U-G User Manual.
The 905U radio has been designed to meet the requirements of unlicensed operation for remote
monitoring and control of equipment. That is, a radio licence is not required for the 905U modules in
many countries. See Chapter Five Specifications for details. The 105U radio is suitable for fixed
frequency licensed channels in the 380-520MHz band - that is, a radio license is required to use the
105U products, but not the 905U products.
I/O Types
Radio
Serial
Digital
Inputs (DI)
4 4 4 to 16
Digital
Outputs (DO)
4 (relay) 1 (FET) 8 (FET) 4 to 16 (FET)
Analog
Inputs (AI)
2 (4-20mA) 6 (0-20mA)
Analog
Outputs (AO)
2 (4-20mA) 8 (0-20mA)
Pulse Inputs
(PI)
1 (100Hz) 4 (1x1KHz,
3x100Hz)
4 (1x1KHz,
3x100Hz)
Pulse
Outputs (PO)
1 (100Hz) 4 (100 Hz) 4 (100 Hz)
Comments
PI is DI 1. PO is
separate to DO.
PI’s are the same
as DI’s.
PO’s are the same
as DO’s .
PI/ PO’s are the
same as DI/ DO’s.
Note regarding -4 modules. The 905U/105S-4 has a total of 20 digital I/O. Four are fixed inputs
(also PI’s) and four are fixed outputs (also PO’s). The other 12 are selectable individually as DI or
DO. The I/O range can vary from 16DI + 4DO to 4DI + 16DO or any combination in between.
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