Grass Valley XSwitch Feb 01 2005 - Manual (Page 39)

38 ©2001 XSWITCH Installation and Operations Manual
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MSB needed from CRC= “78”
packet string = Chr$(4)+Chr$(254)+Chr$(LEN)+command string
+Chr$(&HLSB)+Chr$(&HMSB)
6.command string = “1,P,0,0,0”
LEN = 9
input string for CRC = Chr$(4)+Chr$(254)+Chr$(LEN)+command string
CRC program returns:
complete CRC string = “3AE5”
LSB needed from CRC = “E5”
MSB needed from CRC = “3A”
packet string= Chr$(4)+Chr$(254)+Chr$(LEN)+command string +Chr$(&HLSB)+Chr$(&HMSB)
Connector and Pinout Specifications
The connector type is a standard DB9. There is one male (J3) and one female (J4) connector. The control-
ling device (PC) would typically connect to J4.
These are standard, 3 wire RS-232 connections that allow communications between a controlling device
(such as a PC) and the XSWITCH.
They also facilitate communication between multiple XSWITCH units. Pinout information is as follows:
PIN# NAME
J3
1 NC
2 TX
3 RX
4 NC
5 GND
6 NC
7 NC
8 NC
9 NC
J4
1 NC
2 TX
3 RX
4 NC
5 GND
6 NC
7 NC
8 NC
9 NC