Can I increase the number of channels later?
The channel count is fixed by the number of relay outputs on the receiver and by the button layout of the remote control; it cannot be expanded by software or by a setting. If the need grows, you move to a set with more channels. On the AXI side, the ST100 comes in 2 and 4 channels, the ST200 in 2, 4 and 6 channel options; the SF100 and SF200 are 2 channels.
The number of relays on a receiver is a hardware limit. That is why the channel requirement has to be determined before the project is built, leaving room for growth.
When the need grows later, there are three routes:
- Moving to a set with more channels. The cleanest solution. The ST200 family offers 2, 4 and 6 channel options; the ST100 is 2 and 4 channels.
- Adding a second set. A separate receiver and remote control can work on the same site with a separate ID code. The disadvantage is that the operator has to carry two devices.
- Building logic on the panel side. You can get more movements by multiplexing the existing channels with auxiliary relays, timer relays or a small PLC — for example using one channel as a mode selector and another as a direction command. This method gains channels but increases the risk of operating errors and wrong modes; it is not preferred for safety-related movements.
In practice the soundest approach is to buy one step more channels than today's need; leaving a spare channel for a future boom, slew or second platform axis is far cheaper than swapping the set later.
The full topic: Wireless Crane Remote Control Selection Guide