Proxima ASA 7911 - Manual (Page 92)

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RS-232 Pin Status Reply
BYTE response (ASCII ‘p’, 70H)
BYTE seqno
BYTE status
0= success
1= error
4 BYTES IP address of remote node
BYTE pin status
The pin status byte b will consist of the following fields:
b0: 1 if DTR is asserted
b1: 1 if DSR is asserted
b2: 1 if RTS is asserted
b3: 1 if CTS is asserted
b4: 1 if CD is asserted
b5: 1 if the destination has sent a BREAK
b6: reserved and always 0
b7: reserved and always 0