These modules have 16 relays with inputs located on rear panel header connectors and outputs bussed on the motherboard. The G-2S has 2 Pole, Type S relays, two 20 pin headers (requires signal I/O mod and limits mainframe to 15 switch modules).
$525.00
3 Pole Signal I/O
4×1 One Pole Terminated Type S Reed
2×1 One Pole Failsafe 50 Ohm
2×1 One Pole Type S Reed w/BNC