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, Type S relays, 50 pin header (requires signal I/O mod and limits mainframe to 15 switch modules)
2 Pole, High Voltage (BE) relays, choose connectors and configuration
8×1 High Isolation Terminated Switch Module w/BNC
4×1 One Pole Type S Reed w/BNC