| MODELS | SERIAL PORT | ANALOG INPUTS  | 
DIGITAL INPUTS | DIGITAL OUTPUTS | FREQUENCY | 
| GRD1620-XF-4GA | 1 RS232 / 1 RS485  | 
--- | --- | --- | Latin America and Australia | 
| GRD1620-XF-4GM | 1 RS232 / 1 RS485  | 
--- | --- | --- | Global | 
| GRD3621-XF-4GA | --- | 2 0-1V/0-10V/4-20mA Configurables of Software (PT100 input)  | 
4 (4 for pulses of up to 50Hz) Configurables of Software  | 
Latin America and Australia | |
| GRD3621-XF-4GM | --- | 2 0-1V/0-10V/4-20mA Configurables of Software (PT100 input)  | 
4 (4 for pulses of up to 50Hz) Configurables of Software  | 
Global | |
| GRD3625-XF-4GA | 1 RS232 / 1 RS485  | 
4 0-1V/0-10V/4-20mA Configurables of Software  | 
6 (6 for pulses of up to 50Hz) Configurables of Software  | 
Latin America and Australia | |
| GRD3625-XF-4GM | 1 RS232 / 1 RS485  | 
4 0-1V/0-10V/4-20mA Configurables of Software  | 
6 (6 for pulses of up to 50Hz) Configurables of Software  | 
Global | |
| GRD3534-XF-4GA | 2 RS232 / RS485 | 8 Configurables 0-1V/0-10V/4-20mA  | 
16 (8 for pulses of to 1KHz)  | 
8 | Latin America and Australia | 
| GRD3534-XF-4GM | 2 RS232 / RS485 | 8 Configurables 0-1V/0-10V/4-20mA  | 
16 (8 for pulses of to 1KHz)  | 
8 | Global |