# GL8200 RS232 Specification **URL:** \ **Category:** Documentation feedback\ **Created:** [October 2, 2016, 12:32pm UTC](https://forum.sierrawireless.com/t/gl8200-rs232-specification/8829 "2016-10-02T12:32:48Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![Bob1974](https://avatars.discourse-cdn.com/v4/letter/b/7ea924/32.png) [@Bob1974](https://forum.sierrawireless.com/u/Bob1974)\ **Post date:** [October 2, 2016, 12:32pm UTC](https://forum.sierrawireless.com/t/gl8200-rs232-specification/8829/1 "2016-10-02T12:32:48Z")
The data sheet for the GL8200 doesn’t list the min/max voltage allowance on the RS232 interface. Below is what the data sheet says - The specified voltage and note imply that maybe it shouldn’t be hooked up to a real RS232 converter (+/-15V levels), but can it? It should specify the output +/- levels (is it +/-5.5V or +5.5/0V?) and the allowable input level ranges. Pin # Signal I/O I/O Type Voltage Description 1 VIN-VBUS I Power Supply 4.75V – 32V 4.75V to 32V DC input 2 RS232-DTR I RS-232 5.5V Data Terminal Ready 3 RS232-RXD O RS-232 5.5V Receive Serial Data 4 RS232-CTS O RS-232 5.5V Clear To Send 5 - - - - Reserved 6 GND - GND GND Ground 7 RS232-TXD I RS-232 5.5V Transmit Serial Data 8 RS232- RTS I RS-232 5.5V Request To Send Note: Pins 2-4 and Pins 7-8 are used by the serial link interface. It is strictly prohibited to connect them to any power supply at the risk of damaging the GL8200.