cishoy wrote:
I am also looking to control the ATEM 4 M/E using the RS-422 serial port with a control system. I am just looking for simple source to destination commands. I just joined the forum, and I've been searching for the GVP100 document. Are these the same commands you found to work? Care to share what worked for you?
I can share:
First of all connect to the RS422 port with 38400, 8bits, 1 stop bit,
Odd parity.
Then each command starts with a <break>: a break means pulling the line to a zero level for longer than a frame duration. In my crude test I just manually reversed RX+ and RX- for a second or so with a switch.
Then there are a few commands that worked for me like:
Set Program to input 1: 0x30 0x03 0x01 0xC1 0x01
Set Program to input 2: 0x30 0x03 0x01 0xC1 0x02
Set Preview to input 1: 0x30 0x03 0x01 0xC2 0x01
Set Preview to input 2: 0x30 0x03 0x01 0xC2 0x02
Read current Program source: 0x30 0x02 0x01 0x41
Perform auto-transition on the T-bar: 0x30 0x03 0x01 0xfb 0x0b
It's hard to find this info from BMD, but competing brands use the same protocol, even if it is on RS232, and do have proper documentation.
Also worth mentioning: When the TV Studio HD (v7.5.2) boots, it spits out some data at what seems to bee 115200bps. But this has nothing to do with GVG100, so just ignore that.