Installation guide

V3.8
OnTime Industrial Ethernet
U/R/T200 series Installation Guide
- 34 -
6.2 Serial Time Server
Table 1 in chapter 6.1 shows the pin-out of the T208 serial interface connector. Only the RS-
422 transmit pairs shall be used if the switch is enabled for SNTP client/serial time server
support. This means pin 1 (RS-422 TX+) and pin 11 (RS-422 TX-).
These pins shall be connected to the corresponding receive pairs (RX+ and RX-) on the serial
devices enabled for time client support. Several serial devices (up to 32) can be connected
on the same serial interface according to the RS-422 standard.
The RS-422 serial interface has the following configuration:
• Baudrate: 9600
• Data bit: 8
• Stop bit 1
• Parity No
The connector type for the T208 switch is the same as for the GPS receiver:
15-pol high density D-sub type connector, female part on the switch and male part on cable
assembly.
The RS-422 interface shall always be terminated in the receiver side at the bus end-point.
A termination resistor (120 Ohm) shall be mounted in the connector between the positive and
negative conductor.
7 Return procedure
Contact your equipment supplier before returning any equipment.
Equipment will not be accepted without an RMA number.